From 9674fc9cbe7b01fd8b526e2de14d39cd183fdc1c Mon Sep 17 00:00:00 2001
From: Nik Afiq <nik.afiq98@ymail.com>
Date: Sat, 6 Dec 2025 03:03:30 +0900
Subject: [PATCH] Squashed commit of the following:

commit da3f3bff39f09e753c1c52de0c47a12383cd20dc
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 02:49:31 2025 +0900

    docs: add README files for frontend and backend with setup instructions and commands

commit df71faa0751d1cef3ad6d50d0293fb8f8239d000
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 02:44:13 2025 +0900

    chore: update Vite version and add Vitest configuration

    - Updated Vite dependency from rolldown-vite@7.1.12 to ^5.4.11 in package.json.
    - Added setup file for Vitest to handle Vite SSR helpers, preventing ReferenceError during unit tests.
    - Created a new tsconfig.vitest.json file extending the main tsconfig for Vitest compatibility.
    - Added vitest.config.ts to configure Vitest with Node environment and setup files.

commit f3a1710dd0fe12998965992f6b5f8803422087cf
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 02:37:32 2025 +0900

    feat: add testing framework and implement unit tests for API and config

    - Added Vitest as a testing framework with scripts for running tests.
    - Created unit tests for the `fetchSchedule` and `fetchServerNow` functions in `watchparty.test.ts`.
    - Implemented unit tests for configuration functions in `config.test.ts`.
    - Added utility functions for parsing time in `time.ts` with corresponding tests in `time.test.ts`.
    - Updated API error handling to use `unknown` type for better type safety.
    - Refactored `TimeSyncNotice` and `Timer` components to improve performance and error handling.
    - Enhanced toast notifications by moving related functions to `toastBus.ts`.
    - Improved type definitions across various files for better type safety and clarity.

commit 0d436849fc4a0b87d0c73f4fe14fe1e272d47ad9
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 02:30:01 2025 +0900

    Refactor components to utilize centralized configuration: update TimeSyncNotice and Timer to use config for intervals; enhance error handling and retry logic in ShowsPage.

commit 8dbd4d207a471d05fab8c6f9cd95e3f4f7ec9099
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 02:22:28 2025 +0900

    Refactor API endpoint handling: replace join function with buildApiUrl for cleaner URL construction; update BrowserRouter basename to use config

commit 3e327aa73877034019dffe262580536f4be7c62e
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 02:18:31 2025 +0900

    Refactor configuration management: introduce config.ts for centralized app configuration; update API endpoint handling and logger to use new config

commit 131984d1baf368f94a14a62986eaf028ebbd7c86
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 02:11:33 2025 +0900

    Refactor API types: move ScheduleResponse and ShowItem types to a new types.ts file; update imports in watchparty and Timer components

commit 8faa4661a9ccc0691490a5766f0eb1d97f24b6e5
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 02:05:42 2025 +0900

    Refactor API handling: introduce centralized error handling and logging; replace direct fetch calls with apiFetch in Timer, ShowsPage, and hooks

commit ffde7e89fcab6f48c6023afab73e4b2e1122efa5
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 01:52:36 2025 +0900

    Add dist directory to .gitignore

commit 128a5be6eaa16bf4db5f7dd832b1d461fa2b835d
Author: Nik Afiq <nik.afiq98@ymail.com>
Date:   Sat Dec 6 01:52:28 2025 +0900

    Add toast notifications and debug overlay components; refactor Timer and ShowsPage for error handling
---
 .gitignore                                 |    1 +
 README.md                                  |   86 +-
 backend/README.md                          |   39 +
 frontend/Dockerfile                        |    2 +
 frontend/README.md                         |   43 +
 frontend/package-lock.json                 | 1372 +++++++++++++++-----
 frontend/package.json                      |   10 +-
 frontend/src/App.tsx                       |    6 +-
 frontend/src/api/client.ts                 |  111 ++
 frontend/src/api/endpoint.ts               |   10 +-
 frontend/src/api/types.ts                  |   23 +
 frontend/src/api/watchparty.test.ts        |   35 +
 frontend/src/api/watchparty.ts             |   97 ++
 frontend/src/components/DebugOverlay.tsx   |   89 ++
 frontend/src/components/TimeSyncNotice.tsx |   49 +-
 frontend/src/components/Timer.tsx          |  143 +-
 frontend/src/components/Toasts.tsx         |   42 +
 frontend/src/config.test.ts                |   30 +
 frontend/src/config.ts                     |   61 +
 frontend/src/hooks/useServerClock.ts       |   23 +-
 frontend/src/hooks/useTimeSkew.ts          |   42 +-
 frontend/src/index.css                     |  106 +-
 frontend/src/main.tsx                      |    5 +-
 frontend/src/pages/ShowsPage.tsx           |   88 +-
 frontend/src/test/setup.ts                 |   27 +
 frontend/src/utils/logger.ts               |   47 +-
 frontend/src/utils/time.test.ts            |   28 +
 frontend/src/utils/time.ts                 |   28 +
 frontend/src/utils/toastBus.ts             |   52 +
 frontend/tsconfig.vitest.json              |    7 +
 frontend/vitest.config.ts                  |   14 +
 31 files changed, 2120 insertions(+), 596 deletions(-)
 create mode 100644 backend/README.md
 create mode 100644 frontend/README.md
 create mode 100644 frontend/src/api/client.ts
 create mode 100644 frontend/src/api/types.ts
 create mode 100644 frontend/src/api/watchparty.test.ts
 create mode 100644 frontend/src/api/watchparty.ts
 create mode 100644 frontend/src/components/DebugOverlay.tsx
 create mode 100644 frontend/src/components/Toasts.tsx
 create mode 100644 frontend/src/config.test.ts
 create mode 100644 frontend/src/config.ts
 create mode 100644 frontend/src/test/setup.ts
 create mode 100644 frontend/src/utils/time.test.ts
 create mode 100644 frontend/src/utils/time.ts
 create mode 100644 frontend/src/utils/toastBus.ts
 create mode 100644 frontend/tsconfig.vitest.json
 create mode 100644 frontend/vitest.config.ts

diff --git a/.gitignore b/.gitignore
index 93ecf03..a743447 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .env
 .cache
 .DS_Store
+*/dist
 */node_modules
\ No newline at end of file
diff --git a/README.md b/README.md
index 8167d30..6323aae 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,40 @@
 # Watch Party (Frontend + Backend)
 
-Watch Party is a small full-stack app:
+Watch Party is a small full-stack app for synchronized viewing with a live timer and episode control.
 
-- **Frontend:** Vite + React + TypeScript, served by **Nginx**  
-- **Backend:** Go (Gin) API + PostgreSQL  
-- **Orchestration:** One **docker-compose** that keeps FE/BE split on the same internal network  
-- **Routing:** Your Debian Nginx is the public entrypoint and reverse-proxies to the Mac mini (where this stack runs)
+## Features
+- Live timer with server-synced clock and schedule-driven start/end.
+- Episode selector (set current episode + optional custom start time).
+- Time-skew banner (warns when client clock is off).
+- Debug-only logging overlay and error toasts for API failures (enable with `FRONTEND_MODE=debug` / `VITE_APP_MODE=debug`).
 
+## Prerequisites
+- Docker + Docker Compose plugin.
+- Node.js 20+ (for local frontend dev/test).
+- Go 1.22+ (for local backend dev/test).
+- A `.env` file at repo root (see template below).
+
+## Deploy (compose)
+```bash
+docker compose build
+docker compose up -d
+```
+Open: `http://<mac-mini-LAN-IP>:3000/watch-party/`
+
+Health checks:
+- Web (nginx): `curl http://<mac-mini-LAN-IP>:3000/`
+- API via web proxy: `curl http://<mac-mini-LAN-IP>:3000/api/healthz`
+- API direct (inside network): `curl http://api:8082/healthz`
+
+Logs:
+```bash
+docker compose logs -f migrate
+docker compose logs -f api
+docker compose logs -f web
+docker compose logs -f db
+```
+
+Architecture:
 ```
 router → Debian nginx (TLS) → Mac mini :3000 → [web nginx ↔ api ↔ db]
 ```
@@ -80,30 +108,6 @@ PGSSLMODE=disable
 
 ---
 
-## Run (Production-like)
-
-```bash
-docker compose build
-docker compose up -d
-```
-
-Open: `http://<mac-mini-LAN-IP>:3000/watch-party/`
-
-Health checks:
-- Web (nginx): `curl http://<mac-mini-LAN-IP>:3000/`
-- API through web proxy: `curl http://<mac-mini-LAN-IP>:3000/api/healthz`
-- API direct (inside network only): `curl http://api:8082/healthz` (from another container)
-
-Logs:
-```bash
-docker compose logs -f migrate   # should start, apply SQL, and exit 0
-docker compose logs -f api
-docker compose logs -f web
-docker compose logs -f db
-```
-
----
-
 ## Debian Nginx (public reverse proxy)
 
 Terminate TLS on Debian and forward to the Mac mini:
@@ -129,25 +133,9 @@ Security headers & HSTS on Debian are recommended.
 ---
 
 ## Local Development (hot reload)
-
-You can dev each side outside Docker:
-
-- **Frontend**
-  ```bash
-  cd frontend
-  npm ci
-  npm run dev     # http://localhost:5173
-  ```
-  Configure your FE to call the API (e.g., via a local `.env` or vite config).
-
-- **Backend**
-  ```bash
-  cd backend
-  go run ./cmd/server
-  ```
-  Make sure Postgres is reachable (either from the compose `db` or your local).
-
-For a dev-only compose with Vite HMR, create an override (not included here).
+See per-service READMEs:
+- Frontend: `frontend/README.md`
+- Backend: `backend/README.md`
 
 ---
 
@@ -194,4 +182,4 @@ curl http://<mac-mini-LAN-IP>:3000/api/current
 
 ## License
 
-MIT 
\ No newline at end of file
+MIT 
diff --git a/backend/README.md b/backend/README.md
new file mode 100644
index 0000000..7b2ae75
--- /dev/null
+++ b/backend/README.md
@@ -0,0 +1,39 @@
+# Backend (Go + Gin)
+
+REST API that serves the schedule/time endpoints and current episode control. Built in Go, containerized with a multi-stage Dockerfile.
+
+## Prerequisites
+- Go 1.22+
+- PostgreSQL reachable (uses env-driven DSN pieces)
+- `golang-migrate` not required locally (migrations shipped in repo)
+
+## Env
+The server builds its DSN from:
+- `PGHOST`, `POSTGRES_PORT`, `POSTGRES_USER`, `POSTGRES_PASSWORD`, `POSTGRES_DB`, `PGSSLMODE`
+- `ADDR` (listen address, default `:8082`)
+- `GIN_MODE` (e.g., `release`)
+
+## Commands
+```bash
+# Run locally (expects Postgres per env)
+go run ./cmd/server
+
+# Run migrations
+go run ./cmd/migrate
+
+# Tests
+go test ./...
+```
+
+## Docker build (used by compose)
+```bash
+docker build -t watchparty-backend .
+```
+Compose uses the same image for `api` and the one-off `migrate` job.
+
+## Endpoints (key)
+- `GET /api/v1/time` — server time for client clock sync
+- `GET /api/v1/current` — current schedule item
+- `POST /api/v1/current` — set current episode (expects `{ id, start_time? }`)
+- `GET /api/v1/shows` — list of episodes
+- `GET /healthz` — health check
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 5c2b718..a839946 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -11,6 +11,8 @@ ENV PUBLIC_BASE_PATH=${PUBLIC_BASE_PATH}
 ARG FRONTEND_MODE=production
 ENV FRONTEND_MODE=${FRONTEND_MODE}
 ENV VITE_APP_MODE=${FRONTEND_MODE}
+ARG VITE_BACKEND_ORIGIN=/api
+ENV VITE_BACKEND_ORIGIN=${VITE_BACKEND_ORIGIN}
 
 RUN npm run build
 
diff --git a/frontend/README.md b/frontend/README.md
new file mode 100644
index 0000000..f7968d7
--- /dev/null
+++ b/frontend/README.md
@@ -0,0 +1,43 @@
+# Frontend (Vite + React + TS)
+
+Single-page app served by Nginx in production. Uses Vite for build/dev, React Router, and debug-gated logging/overlay.
+
+## Prerequisites
+- Node.js 20+
+- npm (uses `package-lock.json`)
+
+## Commands
+```bash
+npm ci                # install deps
+npm run dev           # start Vite dev server (http://localhost:5173)
+npm run build         # type-check + production build
+npm run lint          # eslint
+npm test              # vitest unit tests (config, parsers, API helpers)
+```
+
+## Env/config
+- `PUBLIC_BASE_PATH` (build arg) → Vite `base`/Router `basename` (default `/watch-party/`, use `/` for local dev).
+- `FRONTEND_MODE` → `VITE_APP_MODE` (`debug` enables logging/overlay; `production` disables).
+- `VITE_BACKEND_ORIGIN` (default `/api`) — relative path preferred so Nginx proxy works; avoid baking hosts.
+- Optional polling overrides:
+  - `VITE_INTERVAL_TIME_SYNC_MS` (default 60000)
+  - `VITE_INTERVAL_TIME_SKEW_MS` (default 300000)
+  - `VITE_INTERVAL_SCHEDULE_POLL_MS` (default 60000)
+
+## Running locally
+```bash
+cd frontend
+npm ci
+VITE_APP_MODE=debug npm run dev   # enables debug overlay/logging
+```
+The dev server proxies `/api` to `http://localhost:8082` (see `vite.config.ts`). Adjust if your backend runs elsewhere.
+
+## Docker build
+```bash
+docker build -t watchparty-frontend \
+  --build-arg PUBLIC_BASE_PATH=/watch-party/ \
+  --build-arg FRONTEND_MODE=production \
+  --build-arg VITE_BACKEND_ORIGIN=/api \
+  .
+```
+The runtime Nginx proxy target is controlled separately via `BACKEND_ORIGIN` in the root `.env`/compose.
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 0154190..1c69d25 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -24,7 +24,8 @@
         "globals": "^16.4.0",
         "typescript": "~5.8.3",
         "typescript-eslint": "^8.44.0",
-        "vite": "npm:rolldown-vite@7.1.12"
+        "vite": "^5.4.11",
+        "vitest": "^2.1.8"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -309,38 +310,395 @@
         "node": ">=6.9.0"
       }
     },
-    "node_modules/@emnapi/core": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.5.0.tgz",
-      "integrity": "sha512-sbP8GzB1WDzacS8fgNPpHlp6C9VZe+SJP3F90W9rLemaQj2PzIuTEl1qDOYQf58YIpyjViI24y9aPWCjEzY2cg==",
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.21.5.tgz",
+      "integrity": "sha512-1SDgH6ZSPTlggy1yI6+Dbkiz8xzpHJEVAlF/AM1tHPLsf5STom9rwtjE4hKAF20FfXXNTFqEYXyJNWh1GiZedQ==",
+      "cpu": [
+        "ppc64"
+      ],
       "dev": true,
       "license": "MIT",
       "optional": true,
-      "dependencies": {
-        "@emnapi/wasi-threads": "1.1.0",
-        "tslib": "^2.4.0"
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=12"
       }
     },
-    "node_modules/@emnapi/runtime": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.5.0.tgz",
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+      "resolved": "https://registry.npmjs.org/vite/-/vite-5.4.21.tgz",
+      "integrity": "sha512-o5a9xKjbtuhY6Bi5S3+HvbRERmouabWbyUcpXXUA1u+GNUKoROi9byOJ8M0nHbHYHkYICiMlqxkg1KkYmm25Sw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@oxc-project/runtime": "0.90.0",
-        "fdir": "^6.5.0",
-        "lightningcss": "^1.30.1",
-        "picomatch": "^4.0.3",
-        "postcss": "^8.5.6",
-        "rolldown": "1.0.0-beta.39",
-        "tinyglobby": "^0.2.15"
+        "esbuild": "^0.21.3",
+        "postcss": "^8.4.43",
+        "rollup": "^4.20.0"
       },
       "bin": {
         "vite": "bin/vite.js"
       },
       "engines": {
-        "node": "^20.19.0 || >=22.12.0"
+        "node": "^18.0.0 || >=20.0.0"
       },
       "funding": {
         "url": "https://github.com/vitejs/vite?sponsor=1"
@@ -3140,31 +3803,25 @@
         "fsevents": "~2.3.3"
       },
       "peerDependencies": {
-        "@types/node": "^20.19.0 || >=22.12.0",
-        "esbuild": "^0.25.0",
-        "jiti": ">=1.21.0",
-        "less": "^4.0.0",
-        "sass": "^1.70.0",
-        "sass-embedded": "^1.70.0",
-        "stylus": ">=0.54.8",
-        "sugarss": "^5.0.0",
-        "terser": "^5.16.0",
-        "tsx": "^4.8.1",
-        "yaml": "^2.4.2"
+        "@types/node": "^18.0.0 || >=20.0.0",
+        "less": "*",
+        "lightningcss": "^1.21.0",
+        "sass": "*",
+        "sass-embedded": "*",
+        "stylus": "*",
+        "sugarss": "*",
+        "terser": "^5.4.0"
       },
       "peerDependenciesMeta": {
         "@types/node": {
           "optional": true
         },
-        "esbuild": {
-          "optional": true
-        },
-        "jiti": {
-          "optional": true
-        },
         "less": {
           "optional": true
         },
+        "lightningcss": {
+          "optional": true
+        },
         "sass": {
           "optional": true
         },
@@ -3179,44 +3836,96 @@
         },
         "terser": {
           "optional": true
-        },
-        "tsx": {
-          "optional": true
-        },
-        "yaml": {
-          "optional": true
         }
       }
     },
-    "node_modules/vite/node_modules/fdir": {
-      "version": "6.5.0",
-      "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
-      "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
+    "node_modules/vite-node": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/vite-node/-/vite-node-2.1.9.tgz",
+      "integrity": "sha512-AM9aQ/IPrW/6ENLQg3AGY4K1N2TGZdR5e4gu/MmmR2xR3Ll1+dib+nook92g4TV3PXVyeyxdWwtaCAiUL0hMxA==",
       "dev": true,
       "license": "MIT",
-      "engines": {
-        "node": ">=12.0.0"
+      "dependencies": {
+        "cac": "^6.7.14",
+        "debug": "^4.3.7",
+        "es-module-lexer": "^1.5.4",
+        "pathe": "^1.1.2",
+        "vite": "^5.0.0"
       },
-      "peerDependencies": {
-        "picomatch": "^3 || ^4"
+      "bin": {
+        "vite-node": "vite-node.mjs"
       },
-      "peerDependenciesMeta": {
-        "picomatch": {
-          "optional": true
-        }
-      }
-    },
-    "node_modules/vite/node_modules/picomatch": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
-      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
-      "dev": true,
-      "license": "MIT",
       "engines": {
-        "node": ">=12"
+        "node": "^18.0.0 || >=20.0.0"
       },
       "funding": {
-        "url": "https://github.com/sponsors/jonschlinkert"
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/vitest": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-2.1.9.tgz",
+      "integrity": "sha512-MSmPM9REYqDGBI8439mA4mWhV5sKmDlBKWIYbA3lRb2PTHACE0mgKwA8yQ2xq9vxDTuk4iPrECBAEW2aoFXY0Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "2.1.9",
+        "@vitest/mocker": "2.1.9",
+        "@vitest/pretty-format": "^2.1.9",
+        "@vitest/runner": "2.1.9",
+        "@vitest/snapshot": "2.1.9",
+        "@vitest/spy": "2.1.9",
+        "@vitest/utils": "2.1.9",
+        "chai": "^5.1.2",
+        "debug": "^4.3.7",
+        "expect-type": "^1.1.0",
+        "magic-string": "^0.30.12",
+        "pathe": "^1.1.2",
+        "std-env": "^3.8.0",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^0.3.1",
+        "tinypool": "^1.0.1",
+        "tinyrainbow": "^1.2.0",
+        "vite": "^5.0.0",
+        "vite-node": "2.1.9",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^18.0.0 || >=20.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@types/node": "^18.0.0 || >=20.0.0",
+        "@vitest/browser": "2.1.9",
+        "@vitest/ui": "2.1.9",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
       }
     },
     "node_modules/which": {
@@ -3235,6 +3944,23 @@
         "node": ">= 8"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index 597fdd2..be85eff 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -7,7 +7,9 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
     "react": "^19.1.1",
@@ -26,9 +28,7 @@
     "globals": "^16.4.0",
     "typescript": "~5.8.3",
     "typescript-eslint": "^8.44.0",
-    "vite": "npm:rolldown-vite@7.1.12"
-  },
-  "overrides": {
-    "vite": "npm:rolldown-vite@7.1.12"
+    "vite": "^5.4.11",
+    "vitest": "^2.1.8"
   }
 }
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 1502241..fc345d1 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -3,6 +3,8 @@ import { Link, NavLink, Route, Routes, useLocation } from "react-router-dom";
 import Timer from "./components/Timer";
 import ShowsPage from "./pages/ShowsPage";
 import TimeSyncNotice from "./components/TimeSyncNotice";
+import { ToastViewport } from "./components/Toasts";
+import DebugOverlay from "./components/DebugOverlay";
 import "./index.css";
 
 const TIME_SYNC_OFF_THRESHOLD = 100;
@@ -71,6 +73,8 @@ export default function App() {
           </div>
         </div>
       </main>
+      <ToastViewport />
+      <DebugOverlay />
     </div>
   );
-}
\ No newline at end of file
+}
diff --git a/frontend/src/api/client.ts b/frontend/src/api/client.ts
new file mode 100644
index 0000000..da03d25
--- /dev/null
+++ b/frontend/src/api/client.ts
@@ -0,0 +1,111 @@
+import { logApiError, logApiRequest, logApiResponse } from "../utils/logger";
+
+export type ApiErrorShape = {
+    message: string;
+    status?: number;
+    url?: string;
+    data?: unknown;
+    cause?: unknown;
+};
+
+export class ApiError extends Error {
+    status?: number;
+    url?: string;
+    data?: unknown;
+    constructor(message: string, opts?: Partial<ApiErrorShape>) {
+        super(message);
+        this.name = "ApiError";
+        this.status = opts?.status;
+        this.url = opts?.url;
+        this.data = opts?.data;
+        if (opts?.cause !== undefined) {
+            (this as unknown as { cause: unknown }).cause = opts.cause; // best-effort for debugging visibility
+        }
+    }
+}
+
+type FetchExpect = "json" | "text" | "void";
+
+type MaybeAbortSignal = AbortSignal | null | undefined;
+
+type ApiFetchOptions = RequestInit & {
+    timeoutMs?: number;
+    expect?: FetchExpect;
+    logLabel?: string;
+};
+
+function mergeSignal(signal?: MaybeAbortSignal, timeoutMs?: number) {
+    if (!signal && !timeoutMs) return { signal, cleanup: () => {} };
+
+    const ac = new AbortController();
+    let timeoutId: ReturnType<typeof setTimeout> | null = null;
+
+    if (signal) {
+        if (signal.aborted) {
+            ac.abort(signal.reason);
+        } else {
+            const onAbort = () => ac.abort(signal.reason);
+            signal.addEventListener("abort", onAbort, { once: true });
+        }
+    }
+
+    if (timeoutMs && timeoutMs > 0) {
+        timeoutId = setTimeout(() => {
+            const err = new DOMException("Request timed out", "AbortError");
+            ac.abort(err);
+        }, timeoutMs);
+    }
+
+    const cleanup = () => { if (timeoutId) clearTimeout(timeoutId); };
+    return { signal: ac.signal, cleanup };
+}
+
+async function readBody(res: Response, expect: FetchExpect) {
+    if (expect === "void") return undefined;
+    if (expect === "text") return res.text();
+    // json by default
+    return res.json();
+}
+
+export async function apiFetch<T>(url: string, opts?: ApiFetchOptions): Promise<T> {
+    const { timeoutMs, expect = "json", logLabel, ...init } = opts || {};
+    const { signal: mergedSignal, cleanup } = mergeSignal(init.signal, timeoutMs);
+    const headers = { Accept: "application/json", ...(init.headers || {}) };
+    const label = logLabel || url;
+
+    try {
+        logApiRequest(label, { url, method: init.method || "GET" });
+        const res = await fetch(url, { ...init, headers, signal: mergedSignal || init.signal });
+        logApiResponse(label, res);
+
+        if (!res.ok) {
+            let data: unknown;
+            try { data = await readBody(res, expect); }
+            catch { /* ignore parse errors for error responses */ }
+            throw new ApiError(`HTTP ${res.status}`, { status: res.status, url, data });
+        }
+
+        if (expect === "void") return undefined as T;
+
+        try {
+            const data = (await readBody(res, expect)) as T;
+            return data;
+        } catch (e: unknown) {
+            throw new ApiError("Failed to parse response", { url, cause: e });
+        }
+    } catch (err: unknown) {
+        if (err instanceof ApiError) {
+            logApiError(label, err);
+            throw err;
+        }
+        const message = err instanceof Error ? err.message : "Request failed";
+        const status = err && typeof err === "object" && "status" in err
+            ? Number((err as { status?: unknown }).status)
+            : undefined;
+        const apiErr = new ApiError(message, { url, cause: err, status });
+        logApiError(label, apiErr);
+        throw apiErr;
+    } finally {
+        cleanup();
+    }
+}
diff --git a/frontend/src/api/endpoint.ts b/frontend/src/api/endpoint.ts
index 456e6d7..08c1aad 100644
--- a/frontend/src/api/endpoint.ts
+++ b/frontend/src/api/endpoint.ts
@@ -1,7 +1,9 @@
+import { buildApiUrl } from "../config";
+
 export const API_ENDPOINT = {
     v1: {
-        CURRENT: `/api/v1/current`,
-        SHOWS: `/api/v1/shows`,
-        TIME: `/api/v1/time`
+        CURRENT: buildApiUrl("/v1/current"),
+        SHOWS: buildApiUrl("/v1/shows"),
+        TIME: buildApiUrl("/v1/time"),
     },
-} as const;
\ No newline at end of file
+} as const;
diff --git a/frontend/src/api/types.ts b/frontend/src/api/types.ts
new file mode 100644
index 0000000..fff625b
--- /dev/null
+++ b/frontend/src/api/types.ts
@@ -0,0 +1,23 @@
+// Shared API response shapes for the frontend.
+
+export type TimeResponse = {
+    now: number | string;
+};
+
+export type ScheduleResponse = {
+    ep_num: number;
+    ep_title: string;
+    season_name: string;
+    start_time?: string;
+    playback_length?: string;
+};
+
+export type ShowItem = {
+    id: number;
+    ep_num: number;
+    ep_title: string;
+    season_name: string;
+    start_time: string;
+    playback_length: string;
+    date_created: string;
+};
diff --git a/frontend/src/api/watchparty.test.ts b/frontend/src/api/watchparty.test.ts
new file mode 100644
index 0000000..0b5e0a6
--- /dev/null
+++ b/frontend/src/api/watchparty.test.ts
@@ -0,0 +1,35 @@
+import { describe, expect, it, vi, afterEach } from "vitest";
+import { fetchSchedule, fetchServerNow } from "./watchparty";
+
+const mockFetch = (payload: unknown, ok = true, status = 200) => {
+    const response = new Response(JSON.stringify(payload), { status, statusText: ok ? "OK" : "Error" });
+    return vi.spyOn(globalThis, "fetch").mockResolvedValue(response as Response);
+};
+
+afterEach(() => {
+    vi.restoreAllMocks();
+});
+
+describe("fetchSchedule", () => {
+    it("normalizes schedule payload", async () => {
+        const spy = mockFetch({
+            ep_num: "2",
+            ep_title: "Title",
+            season_name: "S1",
+            start_time: "10:00",
+            playback_length: "01:00:00",
+        });
+        const res = await fetchSchedule();
+        expect(res.ep_num).toBe(2);
+        expect(res.ep_title).toBe("Title");
+        expect(spy).toHaveBeenCalled();
+    });
+});
+
+describe("fetchServerNow", () => {
+    it("converts seconds to ms", async () => {
+        mockFetch({ now: 1700000000 }); // seconds
+        const ms = await fetchServerNow();
+        expect(ms).toBe(1700000000 * 1000);
+    });
+});
diff --git a/frontend/src/api/watchparty.ts b/frontend/src/api/watchparty.ts
new file mode 100644
index 0000000..beffa9e
--- /dev/null
+++ b/frontend/src/api/watchparty.ts
@@ -0,0 +1,97 @@
+import { API_ENDPOINT } from "./endpoint";
+import { ApiError, apiFetch } from "./client";
+import type { ScheduleResponse, ShowItem, TimeResponse } from "./types";
+
+export type { ScheduleResponse, ShowItem, TimeResponse } from "./types";
+
+function asNumber(v: unknown, fallback = 0) {
+    const n = typeof v === "number" ? v : Number(v);
+    return Number.isFinite(n) ? n : fallback;
+}
+
+function asString(v: unknown, fallback = "") {
+    return typeof v === "string" ? v : fallback;
+}
+
+function normalizeSchedule(data: unknown): ScheduleResponse {
+    if (data == null || typeof data !== "object") {
+        throw new ApiError("Bad schedule payload", { url: API_ENDPOINT.v1.CURRENT, data });
+    }
+    const obj = data as Record<string, unknown>;
+    return {
+        ep_num: asNumber(obj.ep_num, 0),
+        ep_title: asString(obj.ep_title, "未設定"),
+        season_name: asString(obj.season_name, "未設定"),
+        start_time: obj.start_time ? asString(obj.start_time) : undefined,
+        playback_length: obj.playback_length ? asString(obj.playback_length) : undefined,
+    };
+}
+
+function normalizeShows(data: unknown): ShowItem[] {
+    if (!Array.isArray(data)) {
+        throw new ApiError("Shows payload is not an array", { url: API_ENDPOINT.v1.SHOWS, data });
+    }
+    return data.map((item) => {
+        if (!item || typeof item !== "object") {
+            throw new ApiError("Bad show item", { url: API_ENDPOINT.v1.SHOWS, data: item });
+        }
+        const obj = item as Record<string, unknown>;
+        const id = asNumber(obj.id, NaN);
+        if (!Number.isFinite(id)) {
+            throw new ApiError("Show item missing id", { url: API_ENDPOINT.v1.SHOWS, data: item });
+        }
+        return {
+            id,
+            ep_num: asNumber(obj.ep_num, 0),
+            ep_title: asString(obj.ep_title, "不明"),
+            season_name: asString(obj.season_name, "不明"),
+            start_time: asString(obj.start_time, ""),
+            playback_length: asString(obj.playback_length, ""),
+            date_created: asString(obj.date_created, ""),
+        };
+    });
+}
+
+export async function fetchSchedule(signal?: AbortSignal) {
+    const data = await apiFetch<ScheduleResponse>(API_ENDPOINT.v1.CURRENT, {
+        signal,
+        timeoutMs: 12_000,
+        logLabel: "load schedule",
+    });
+    return normalizeSchedule(data);
+}
+
+export async function fetchShows(signal?: AbortSignal) {
+    const data = await apiFetch<ShowItem[]>(API_ENDPOINT.v1.SHOWS, {
+        signal,
+        timeoutMs: 12_000,
+        logLabel: "fetch shows",
+    });
+    return normalizeShows(data);
+}
+
+export async function postCurrentEpisode(payload: { id: number; start_time?: string }, signal?: AbortSignal) {
+    await apiFetch<void>(API_ENDPOINT.v1.CURRENT, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(payload),
+        signal,
+        timeoutMs: 12_000,
+        expect: "void",
+        logLabel: "set current episode",
+    });
+}
+
+export async function fetchServerNow(signal?: AbortSignal): Promise<number> {
+    const data = await apiFetch<TimeResponse>(API_ENDPOINT.v1.TIME, {
+        signal,
+        timeoutMs: 8_000,
+        logLabel: "server time",
+    });
+    let n = typeof data?.now === "number" ? data.now : Number(data?.now);
+    if (!Number.isFinite(n)) {
+        throw new ApiError("Bad time payload", { url: API_ENDPOINT.v1.TIME, data });
+    }
+    if (n < 1e12) n = n * 1000; // seconds → ms
+    return n;
+}
diff --git a/frontend/src/components/DebugOverlay.tsx b/frontend/src/components/DebugOverlay.tsx
new file mode 100644
index 0000000..f25a1b6
--- /dev/null
+++ b/frontend/src/components/DebugOverlay.tsx
@@ -0,0 +1,89 @@
+import { useEffect, useMemo, useState } from "react";
+import type { DebugLog, Level } from "../utils/logger";
+import { subscribeLogs, logger } from "../utils/logger";
+
+function fmt(ts: number) {
+    const d = new Date(ts);
+    return d.toLocaleTimeString(undefined, { hour12: false }) + "." + String(d.getMilliseconds()).padStart(3, "0");
+}
+
+function levelLabel(l: Level) {
+    if (l === "debug") return "DBG";
+    if (l === "info") return "INF";
+    if (l === "warn") return "WRN";
+    return "ERR";
+}
+
+export default function DebugOverlay() {
+    const [open, setOpen] = useState<boolean>(() => {
+        return logger.enabled && (localStorage.getItem("debugOverlay") === "1");
+    });
+    const [logs, setLogs] = useState<DebugLog[]>([]);
+
+    useEffect(() => subscribeLogs(setLogs), []);
+
+    useEffect(() => {
+        const onKey = (e: KeyboardEvent) => {
+            if (e.key.toLowerCase() === "d" && e.shiftKey && e.ctrlKey) {
+                setOpen((v) => {
+                    const next = !v;
+                    if (next) localStorage.setItem("debugOverlay", "1");
+                    else localStorage.removeItem("debugOverlay");
+                    return next;
+                });
+            }
+        };
+        window.addEventListener("keydown", onKey);
+        return () => window.removeEventListener("keydown", onKey);
+    }, []);
+
+    const rendered = useMemo(() => logs.slice(-30).reverse(), [logs]);
+
+    if (!logger.enabled) return null;
+
+    return (
+        <div className={`debug-overlay ${open ? "open" : ""}`}>
+            <button
+                className="debug-toggle"
+                onClick={() => {
+                    const next = !open;
+                    setOpen(next);
+                    if (next) localStorage.setItem("debugOverlay", "1");
+                    else localStorage.removeItem("debugOverlay");
+                }}
+            >
+                Debug {open ? "On" : "Off"}
+            </button>
+            {open && (
+                <div className="debug-panel">
+                    <div className="debug-header">Recent API logs (Ctrl+Shift+D to toggle)</div>
+                    <div className="debug-body">
+                        {rendered.length === 0 && <div className="debug-empty">No logs yet.</div>}
+                        {rendered.map((l) => {
+                            let detailText: string | null = null;
+                            if (l.details !== undefined) {
+                                if (typeof l.details === "string") detailText = l.details;
+                                else {
+                                    try { detailText = JSON.stringify(l.details); }
+                                    catch { detailText = String(l.details); }
+                                }
+                            }
+                            return (
+                                <div key={l.id} className={`debug-row level-${l.level}`}>
+                                    <span className="debug-ts">{fmt(l.ts)}</span>
+                                    <span className="debug-level">{levelLabel(l.level)}</span>
+                                    <span className="debug-label">{l.label}</span>
+                                    {detailText && (
+                                        <span className="debug-details">
+                                            {detailText}
+                                        </span>
+                                    )}
+                                </div>
+                            );
+                        })}
+                    </div>
+                </div>
+            )}
+        </div>
+    );
+}
diff --git a/frontend/src/components/TimeSyncNotice.tsx b/frontend/src/components/TimeSyncNotice.tsx
index 57f97dc..119284e 100644
--- a/frontend/src/components/TimeSyncNotice.tsx
+++ b/frontend/src/components/TimeSyncNotice.tsx
@@ -1,5 +1,6 @@
-import { useEffect, useState } from "react";
+import { useEffect, useMemo, useState } from "react";
 import { useTimeSkew } from "../hooks/useTimeSkew";
+import { config } from "../config";
 
 function formatDelay(ms: number, withSign = true) {
     const sign = withSign ? (ms > 0 ? "+" : ms < 0 ? "−" : "") : "";
@@ -25,10 +26,13 @@ export default function TimeSyncNotice({
     dismissTtlMs?: number;
     storageScope?: "session" | "local";
 }) {
-    const { skewMs, rttMs, recheck } = useTimeSkew({ intervalMs });
+    const { skewMs, rttMs, recheck, error } = useTimeSkew({ intervalMs: intervalMs ?? config.intervals.timeSkewMs });
 
     const KEY = "timesync.dismissedUntil";
-    const store = storageScope === "local" ? window.localStorage : window.sessionStorage;
+    const store = useMemo(
+        () => (storageScope === "local" ? window.localStorage : window.sessionStorage),
+        [storageScope],
+    );
 
     // read dismissed state (true if now < dismissedUntil)
     const [dismissed, setDismissed] = useState<boolean>(() => {
@@ -56,36 +60,45 @@ export default function TimeSyncNotice({
                 store.removeItem(KEY);
             }
         } catch {
-            /* ignore */
+            // ignore storage errors
         }
         return () => { if (id) clearTimeout(id); };
-        // eslint-disable-next-line react-hooks/exhaustive-deps
-    }, [dismissed]);
+    }, [dismissed, store]);
 
     // if skew returns within threshold, clear dismissal so it can show again later if it drifts
     useEffect(() => {
         if (skewMs != null && Math.abs(skewMs) <= thresholdMs && dismissed) {
             setDismissed(false);
-            try { store.removeItem(KEY); } catch { }
+            try { store.removeItem(KEY); } catch { void 0; }
         }
-    }, [skewMs, thresholdMs, dismissed]);
+    }, [skewMs, thresholdMs, dismissed, store]);
 
-    if (dismissed || skewMs == null || Math.abs(skewMs) <= thresholdMs) return null;
+    if (dismissed) return null;
 
-    const ahead = skewMs > 0;
-    const msgJa = ahead
-        ? `端末の時計が正確な時刻より ${formatDelay(skewMs)} 進んでいます（通信往復遅延 ${rttMs ?? "-"}ms）`
-        : `端末の時計が正確な時刻より ${formatDelay(-skewMs)} 遅れています（通信往復遅延 ${rttMs ?? "-"}ms）`;
-    const msgEn = ahead
-        ? `Your device clock is ${formatDelay(skewMs)} ahead of the correct time (RTT ${rttMs ?? "-"}ms).`
-        : `Your device clock is ${formatDelay(-skewMs)} behind the correct time (RTT ${rttMs ?? "-"}ms).`;
+    const hasSkew = skewMs != null;
+    const skewVal = skewMs ?? 0;
+    if (!error && (!hasSkew || Math.abs(skewVal) <= thresholdMs)) return null;
+
+    const ahead = skewVal > 0;
+    const msgJa = error
+        ? `時刻同期に失敗しました: ${error}`
+        : ahead
+            ? `端末の時計が正確な時刻より ${formatDelay(skewVal)} 進んでいます（通信往復遅延 ${rttMs ?? "-"}ms）`
+            : `端末の時計が正確な時刻より ${formatDelay(-skewVal)} 遅れています（通信往復遅延 ${rttMs ?? "-"}ms）`;
+    const msgEn = error
+        ? `Time sync failed: ${error}`
+        : ahead
+            ? `Your device clock is ${formatDelay(skewVal)} ahead of the correct time (RTT ${rttMs ?? "-"}ms).`
+            : `Your device clock is ${formatDelay(-skewVal)} behind the correct time (RTT ${rttMs ?? "-"}ms).`;
 
     const onClose = () => {
         setDismissed(true);
         try {
             const until = Date.now() + dismissTtlMs;
             store.setItem(KEY, String(until));
-        } catch { }
+        } catch {
+            // ignore storage failures
+        }
     };
 
     return (
@@ -101,4 +114,4 @@ export default function TimeSyncNotice({
             </div>
         </div>
     );
-}
\ No newline at end of file
+}
diff --git a/frontend/src/components/Timer.tsx b/frontend/src/components/Timer.tsx
index 329db19..880cec0 100644
--- a/frontend/src/components/Timer.tsx
+++ b/frontend/src/components/Timer.tsx
@@ -1,25 +1,21 @@
-import { useEffect, useMemo, useRef, useState } from "react";
+import React, { useEffect, useMemo, useRef, useState } from "react";
 import { useServerClock } from "../hooks/useServerClock";
-import { API_ENDPOINT } from "../api/endpoint";
-import { logApiError, logApiRequest, logApiResponse } from "../utils/logger";
+import { logApiError } from "../utils/logger";
+import { toastError } from "../utils/toastBus";
+import { fetchSchedule } from "../api/watchparty";
+import type { ScheduleResponse } from "../api/types";
+import { config } from "../config";
+import { parseDurationToSeconds, parseStartTime } from "../utils/time";
 
 // ===== Config & fallbacks =====
 const TIMEZONE = "Asia/Tokyo"; // JST (UTC+09)
-const API_URL_CURRENT = API_ENDPOINT.v1.CURRENT
 const FALLBACK_START_HOUR = 19;
 const FALLBACK_START_MINUTE = 25;
 const FALLBACK_END_SECONDS = 300;
-const TIME_SYNC_INTERVAL = 60_000;
+const TIME_SYNC_INTERVAL = config.intervals.timeSyncMs;
+const SCHEDULE_POLL_INTERVAL = config.intervals.schedulePollMs;
 // ==============================
 
-type ApiSchedule = {
-    ep_num: number;
-    ep_title: string;
-    season_name: string;
-    start_time: string;        // "HH:MM" or "HH:MM:SS"
-    playback_length: string;   // "MM:SS" or "HH:MM:SS"
-};
-
 function formatHMS(total: number) {
     const t = Math.max(0, Math.floor(total));
     const h = Math.floor(t / 3600);
@@ -31,31 +27,6 @@ function formatHMS(total: number) {
     return h > 0 ? `${HH}:${MM}:${SS}` : `${MM}:${SS}`;
 }
 
-function parseStartTime(s?: string): { hour: number; minute: number; second: number } | null {
-    if (!s || typeof s !== "string") return null;
-    const m = /^(\d{1,2}):([0-5]\d)(?::([0-5]\d))?$/.exec(s.trim());
-    if (!m) return null;
-    const hour = Number(m[1]);
-    const minute = Number(m[2]);
-    const second = m[3] ? Number(m[3]) : 0;
-    if (hour < 0 || hour > 23) return null;
-    return { hour, minute, second };
-}
-
-function parseDurationToSeconds(s?: string): number {
-    if (!s || typeof s !== "string") return FALLBACK_END_SECONDS;
-    const parts = s.trim().split(":").map(Number);
-    if (parts.some((n) => Number.isNaN(n) || n < 0)) return FALLBACK_END_SECONDS;
-    if (parts.length === 2) {
-        const [mm, ss] = parts;
-        return mm * 60 + ss;
-    } else if (parts.length === 3) {
-        const [hh, mm, ss] = parts;
-        return hh * 3600 + mm * 60 + ss;
-    }
-    return FALLBACK_END_SECONDS;
-}
-
 function getJstYMD(now = new Date()) {
     const parts = new Intl.DateTimeFormat("en-CA", {
         timeZone: TIMEZONE,
@@ -78,18 +49,8 @@ function jstToUtcMs(y: number, m: number, d: number, hh: number, mm: number, ss
 }
 
 async function loadSchedule(signal?: AbortSignal) {
-    logApiRequest("loadSchedule", { url: API_URL_CURRENT });
-    const res = await fetch(API_URL_CURRENT, { cache: "no-store", signal });
-    logApiResponse("loadSchedule", res);
-    if (!res.ok) throw new Error(`HTTP ${res.status}`);
-    const payload = (await res.json()) as ApiSchedule;
-    logApiResponse("loadSchedule payload", res, {
-        ep_num: payload?.ep_num,
-        start_time: payload?.start_time,
-        playback_length: payload?.playback_length,
-        season_name: payload?.season_name,
-    });
-    return payload;
+    // Shared fetcher handles logging and error shaping.
+    return fetchSchedule(signal) as Promise<ScheduleResponse>;
 }
 
 export default function Timer() {
@@ -113,29 +74,38 @@ export default function Timer() {
         refreshMs: TIME_SYNC_INTERVAL,
     });
 
+    const applySchedule = React.useCallback((data: ScheduleResponse | null) => {
+        if (!data) return;
+        const parsedStart = parseStartTime(data.start_time);
+        const end = parseDurationToSeconds(data.playback_length, FALLBACK_END_SECONDS);
+        const { y, m, d } = getJstYMD();
+        const startMs = parsedStart
+            ? jstToUtcMs(y, m, d, parsedStart.hour, parsedStart.minute, parsedStart.second)
+            : startUtcMs; // keep fallback
+
+        setMeta({ ep_num: data.ep_num, ep_title: data.ep_title, season_name: data.season_name });
+        setStartUtcMs(startMs);
+        setEndSeconds(end);
+        setLoaded(true);
+        setErrorMsg(null);
+    }, [startUtcMs]);
+
+    const fetchAndApply = React.useCallback(async (signal?: AbortSignal) => {
+        try {
+            const data = await loadSchedule(signal);
+            applySchedule(data);
+        } catch (e) {
+            setLoaded(true);
+            setErrorMsg("Failed to load schedule; using defaults.");
+            logApiError("loadSchedule", e);
+            toastError("スケジュール取得に失敗しました", e instanceof Error ? e.message : String(e || ""));
+        }
+    }, [applySchedule]);
+
     // fetch schedule
     useEffect(() => {
         const ac = new AbortController();
-        loadSchedule(ac.signal)
-            .then((data) => {
-                const parsedStart = parseStartTime(data.start_time);
-                const end = parseDurationToSeconds(data.playback_length);
-                const { y, m, d } = getJstYMD();
-                const startMs = parsedStart
-                    ? jstToUtcMs(y, m, d, parsedStart.hour, parsedStart.minute, parsedStart.second)
-                    : startUtcMs; // keep fallback
-
-                setMeta({ ep_num: data.ep_num, ep_title: data.ep_title, season_name: data.season_name });
-                setStartUtcMs(startMs);
-                setEndSeconds(end);
-                setLoaded(true);
-                setErrorMsg(null);
-            })
-            .catch((e) => {
-                setLoaded(true);
-                setErrorMsg("Failed to load schedule; using defaults.");
-                logApiError("loadSchedule", e);
-            });
+        fetchAndApply(ac.signal);
         return () => ac.abort();
         // eslint-disable-next-line react-hooks/exhaustive-deps
     }, []); // mount only
@@ -160,7 +130,7 @@ export default function Timer() {
         };
         tick();
         return () => { if (timerRef.current) window.clearTimeout(timerRef.current); };
-    }, [startUtcMs, endSeconds, nowMs]);
+    }, [startUtcMs, endSeconds, nowMs, ready]);
 
     // status labels
     const startLabel = useMemo(() => {
@@ -193,23 +163,9 @@ export default function Timer() {
             ac?.abort(); // cancel any in-flight
             ac = new AbortController();
             try {
-                const data = await loadSchedule(ac.signal);
-                // Recompute start/end from fresh data
-                const parsedStart = parseStartTime(data.start_time);
-                const end = parseDurationToSeconds(data.playback_length);
-                const { y, m, d } = getJstYMD();
-                const nextStartMs = parsedStart
-                    ? jstToUtcMs(y, m, d, parsedStart.hour, parsedStart.minute, parsedStart.second)
-                    : startUtcMs;
-                setMeta({ ep_num: data.ep_num, ep_title: data.ep_title, season_name: data.season_name });
-                setStartUtcMs(nextStartMs);
-                setEndSeconds(end);
-                setErrorMsg(null);
-                setLoaded(true);
-                // If the new schedule has moved us out of "ended", the ticking effect will handle it.
-            } catch (e) {
-                logApiError("loadSchedule (ended poll)", e);
-                // keep current UI; try again next tick
+                await fetchAndApply(ac.signal);
+            } catch {
+                // fetchAndApply already handles logging/toast
             }
         };
         // immediate fetch once the timer ends
@@ -217,7 +173,7 @@ export default function Timer() {
         // then poll every 60s
         const id = window.setInterval(() => {
             if (!stopped) refetch();
-        }, 60_000);
+        }, SCHEDULE_POLL_INTERVAL);
         return () => {
             stopped = true;
             if (id) window.clearInterval(id);
@@ -278,7 +234,14 @@ export default function Timer() {
             {loaded && phase === "ended" && (
                 <div className="timer-status">再生終了。 開始 {startLabel} JST.</div>
             )}
-            {errorMsg && <div className="timer-status">{errorMsg}</div>}
+            {errorMsg && (
+                <div className="timer-status">
+                    {errorMsg}{" "}
+                    <button className="link-btn" onClick={() => fetchAndApply()}>
+                        再試行
+                    </button>
+                </div>
+            )}
 
             {showPrestartCountdown && (
                 <div className="countdown-overlay" role="status" aria-live="assertive">
diff --git a/frontend/src/components/Toasts.tsx b/frontend/src/components/Toasts.tsx
new file mode 100644
index 0000000..f7b9a60
--- /dev/null
+++ b/frontend/src/components/Toasts.tsx
@@ -0,0 +1,42 @@
+import { useEffect, useState } from "react";
+import type { Toast } from "../utils/toastBus";
+import { dismissToast, subscribeToasts } from "../utils/toastBus";
+
+type ToastProps = {
+    toast: Toast;
+};
+
+function ToastItem({ toast }: ToastProps) {
+    return (
+        <div className={`toast toast-${toast.level}`}>
+            <div className="toast-body">
+                <div className="toast-title">{toast.level === "error" ? "Error" : toast.level === "warn" ? "Warning" : "Info"}</div>
+                <div className="toast-message">{toast.message}</div>
+                {toast.detail && <div className="toast-detail">{toast.detail}</div>}
+            </div>
+            <button className="toast-close" aria-label="Close" onClick={() => dismissToast(toast.id)}>×</button>
+        </div>
+    );
+}
+
+export function ToastViewport() {
+    const [toasts, setToasts] = useState<Toast[]>([]);
+
+    useEffect(() => subscribeToasts(setToasts), []);
+
+    useEffect(() => {
+        const timers = toasts.map((t) => {
+            if (!t.expiresAt) return null;
+            const delay = Math.max(500, t.expiresAt - Date.now());
+            return window.setTimeout(() => dismissToast(t.id), delay);
+        }).filter(Boolean) as number[];
+        return () => timers.forEach((id) => window.clearTimeout(id));
+    }, [toasts]);
+
+    if (toasts.length === 0) return null;
+    return (
+        <div className="toast-viewport" role="status" aria-live="polite">
+            {toasts.map((t) => <ToastItem key={t.id} toast={t} />)}
+        </div>
+    );
+}
diff --git a/frontend/src/config.test.ts b/frontend/src/config.test.ts
new file mode 100644
index 0000000..513c70d
--- /dev/null
+++ b/frontend/src/config.test.ts
@@ -0,0 +1,30 @@
+import { describe, expect, it } from "vitest";
+import { buildApiUrl, normalizeApiBase, normalizeBasePath, envNumber } from "./config";
+
+describe("normalizeBasePath", () => {
+    it("enforces leading and trailing slash", () => {
+        expect(normalizeBasePath("watch")).toBe("/watch/");
+        expect(normalizeBasePath("/watch")).toBe("/watch/");
+        expect(normalizeBasePath("/watch/")).toBe("/watch/");
+    });
+});
+
+describe("normalizeApiBase", () => {
+    it("enforces leading slash and trims trailing", () => {
+        expect(normalizeApiBase("api")).toBe("/api");
+        expect(normalizeApiBase("/api/")).toBe("/api");
+    });
+});
+
+describe("buildApiUrl", () => {
+    it("joins base and path without duplicate slashes", () => {
+        expect(buildApiUrl("/v1/test")).toBe("/api/v1/test");
+        expect(buildApiUrl("v1/test")).toBe("/api/v1/test");
+    });
+});
+
+describe("envNumber", () => {
+    it("returns fallback on bad input", () => {
+        expect(envNumber("MISSING_KEY", 123)).toBe(123);
+    });
+});
diff --git a/frontend/src/config.ts b/frontend/src/config.ts
new file mode 100644
index 0000000..6d5f2f9
--- /dev/null
+++ b/frontend/src/config.ts
@@ -0,0 +1,61 @@
+type AppConfig = {
+    mode: string;
+    isDebug: boolean;
+    basePath: string;
+    apiBase: string;
+    backendOrigin: string;
+    intervals: {
+        timeSyncMs: number;
+        timeSkewMs: number;
+        schedulePollMs: number;
+    };
+};
+
+export function normalizeBasePath(raw?: string) {
+    let v = (raw || "/").trim();
+    if (!v.startsWith("/")) v = `/${v}`;
+    if (!v.endsWith("/")) v = `${v}/`;
+    return v.replace(/\/{2,}/g, "/");
+}
+
+export function normalizeApiBase(raw?: string) {
+    let v = (raw || "/api").trim();
+    if (!v.startsWith("/")) v = `/${v}`;
+    return v.replace(/\/+$/, "");
+}
+
+type ImportMetaEnvish = { env?: Record<string, unknown> };
+
+export function envNumber(key: string, fallback: number) {
+    const rawEnv = (import.meta as ImportMetaEnvish).env || {};
+    const raw = rawEnv[key];
+    if (raw == null) return fallback;
+    const n = Number(raw);
+    return Number.isFinite(n) && n > 0 ? n : fallback;
+}
+
+const rawMode = (import.meta.env.VITE_APP_MODE || import.meta.env.MODE || "").toString().toLowerCase();
+const basePath = normalizeBasePath(import.meta.env.BASE_URL);
+const apiBase = normalizeApiBase(import.meta.env.VITE_BACKEND_ORIGIN);
+const timeSyncMs = envNumber("VITE_INTERVAL_TIME_SYNC_MS", 60_000);
+const timeSkewMs = envNumber("VITE_INTERVAL_TIME_SKEW_MS", 5 * 60_000);
+const schedulePollMs = envNumber("VITE_INTERVAL_SCHEDULE_POLL_MS", 60_000);
+
+export const config: AppConfig = {
+    mode: rawMode || "production",
+    isDebug: rawMode === "debug",
+    basePath,
+    apiBase,
+    backendOrigin: apiBase, // alias for clarity
+    intervals: {
+        timeSyncMs,
+        timeSkewMs,
+        schedulePollMs,
+    },
+};
+
+export function buildApiUrl(path: string) {
+    const p = path.startsWith("/") ? path : `/${path}`;
+    const base = config.apiBase.replace(/\/$/, "");
+    return `${base}${p}`;
+}
diff --git a/frontend/src/hooks/useServerClock.ts b/frontend/src/hooks/useServerClock.ts
index c5f15ad..de16361 100644
--- a/frontend/src/hooks/useServerClock.ts
+++ b/frontend/src/hooks/useServerClock.ts
@@ -1,9 +1,6 @@
 import { useCallback, useEffect, useRef, useState } from "react";
-import { API_ENDPOINT } from "../api/endpoint";
-import { logApiError, logApiRequest, logApiResponse } from "../utils/logger";
-
-/** Uses /api/time => { now: <ms UTC> } and returns a server-correct "nowMs()" */
-const TIME_URL_ENDPOINT = API_ENDPOINT.v1.TIME;
+import { fetchServerNow } from "../api/watchparty";
+import { logApiError } from "../utils/logger";
 
 export function useServerClock(opts?: {
     refreshMs?: number;
@@ -22,19 +19,13 @@ export function useServerClock(opts?: {
         try {
             setError(null);
             const t0 = Date.now();
-            logApiRequest("useServerClock", { url: TIME_URL_ENDPOINT });
-            const res = await fetch(TIME_URL_ENDPOINT, { cache: "no-store" });
+            const serverNow = await fetchServerNow();
             const t1 = Date.now();
-            logApiResponse("useServerClock", res, { roundTripMs: t1 - t0 });
-            if (!res.ok) throw new Error(`HTTP ${res.status}`);
-            const data = await res.json();
-            if (typeof data?.now !== "number") throw new Error("Bad time payload");
-            const s = data.now;
-            const offset = Math.round(((t0 + t1) / 2) - s); // (+) client ahead, (-) client behind
+            const offset = Math.round(((t0 + t1) / 2) - serverNow); // (+) client ahead, (-) client behind
             setOffsetMs(offset);
-            logApiResponse("useServerClock computed", res, { serverNow: s, offset });
-        } catch (e: any) {
-            setError(e?.message || "time sync failed");
+        } catch (e: unknown) {
+            const msg = e instanceof Error ? e.message : "time sync failed";
+            setError(msg);
             logApiError("useServerClock", e);
         }
     }, []);
diff --git a/frontend/src/hooks/useTimeSkew.ts b/frontend/src/hooks/useTimeSkew.ts
index 28b772e..6ce7877 100644
--- a/frontend/src/hooks/useTimeSkew.ts
+++ b/frontend/src/hooks/useTimeSkew.ts
@@ -1,6 +1,6 @@
-import { useEffect, useRef, useState } from "react";
-import { API_ENDPOINT } from "../api/endpoint";
-import { logApiError, logApiRequest, logApiResponse } from "../utils/logger";
+import { useCallback, useEffect, useRef, useState } from "react";
+import { logApiError } from "../utils/logger";
+import { fetchServerNow } from "../api/watchparty";
 
 /**
  * Measures client clock skew vs server time {now: <ms since epoch, UTC>}.
@@ -11,7 +11,6 @@ import { logApiError, logApiRequest, logApiResponse } from "../utils/logger";
  *   offset ≈ ((t0 + t1)/2) - s
  * Positive offset => client is AHEAD by that many ms.
  */
-const TIME_URL_ENDPOINT = API_ENDPOINT.v1.TIME;
 export function useTimeSkew(opts?: {
     intervalMs?: number;
     samples?: number;
@@ -28,34 +27,16 @@ export function useTimeSkew(opts?: {
     const [error, setError] = useState<string | null>(null);
     const timerRef = useRef<number | null>(null);
 
-    const measureOnce = async () => {
+    const measureOnce = useCallback(async () => {
         const t0 = Date.now();
-        logApiRequest("useTimeSkew", { url: TIME_URL_ENDPOINT });
-        const res = await fetch(TIME_URL_ENDPOINT, {
-            cache: "no-store",
-            headers: { Accept: "application/json" },
-        });
+        const serverMs = await fetchServerNow();
         const t1 = Date.now();
-        logApiResponse("useTimeSkew", res, { roundTripMs: t1 - t0 });
-        if (!res.ok) throw new Error(`HTTP ${res.status}`);
-
-        // Robust parsing: number or string, seconds or ms
-        const data = await res.json() as any;
-        let serverMs = typeof data?.now === "number" ? data.now : Number(data?.now);
-        if (!Number.isFinite(serverMs)) {
-            throw new Error("Bad time payload (expecting { now: number })");
-        }
-        // Heuristic: if it's too small to be ms epoch, treat as seconds
-        if (serverMs < 1e12) {               // ~Sat Sep 09 2001 ms epoch
-            serverMs = serverMs * 1000;        // seconds -> ms
-        }
-
         const rtt = t1 - t0;
         const offset = Math.round(((t0 + t1) / 2) - serverMs);
         return { offset, rtt };
-    };
+    }, []);
 
-    const measure = async () => {
+    const measure = useCallback(async () => {
         try {
             setError(null);
             const offsets: number[] = [];
@@ -72,11 +53,12 @@ export function useTimeSkew(opts?: {
             const minRtt = Math.min(...rtts);
             setSkewMs(median);
             setRttMs(minRtt);
-        } catch (e: any) {
-            setError(e?.message || "Time sync failed");
+        } catch (e: unknown) {
+            const msg = e instanceof Error ? e.message : "Time sync failed";
+            setError(msg);
             logApiError("useTimeSkew", e);
         }
-    };
+    }, [samples, measureOnce]);
 
     useEffect(() => {
         if (!enabled) return;
@@ -85,7 +67,7 @@ export function useTimeSkew(opts?: {
             timerRef.current = window.setInterval(measure, intervalMs);
         }
         return () => { if (timerRef.current) window.clearInterval(timerRef.current); };
-    }, [intervalMs, samples, enabled]);
+    }, [intervalMs, samples, enabled, measure]);
 
     return { skewMs, rttMs, error, recheck: measure };
 }
diff --git a/frontend/src/index.css b/frontend/src/index.css
index cc8d6e3..8925693 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -492,4 +492,108 @@ kbd {
 }
 @supports not (container-type: inline-size) {
   .timer-hero { font-size: clamp(28px, 8vw, 96px); }
-}
\ No newline at end of file
+}
+
+/* Toasts */
+.toast-viewport {
+  position: fixed;
+  bottom: 16px;
+  right: 16px;
+  display: grid;
+  gap: 8px;
+  z-index: 200;
+  max-width: 320px;
+}
+.toast {
+  display: grid;
+  grid-template-columns: 1fr auto;
+  gap: 8px;
+  padding: 12px 14px;
+  border-radius: 12px;
+  background: rgba(15, 21, 32, 0.94);
+  border: 1px solid rgba(255,255,255,0.12);
+  box-shadow: 0 12px 30px rgba(0,0,0,0.35);
+}
+.toast.toast-error { border-color: rgba(255, 99, 99, 0.4); }
+.toast.toast-warn { border-color: rgba(255, 193, 99, 0.4); }
+.toast.toast-info { border-color: rgba(121, 192, 255, 0.4); }
+.toast-body { text-align: left; }
+.toast-title { font-weight: 700; font-size: 13px; margin-bottom: 2px; }
+.toast-message { font-size: 13px; color: var(--text); }
+.toast-detail { font-size: 12px; color: var(--subtle); margin-top: 2px; }
+.toast-close {
+  background: transparent;
+  color: var(--subtle);
+  border: none;
+  font-size: 16px;
+  cursor: pointer;
+  align-self: start;
+}
+.toast-close:hover { color: var(--text); }
+
+/* Debug overlay */
+.debug-overlay {
+  position: fixed;
+  bottom: 16px;
+  left: 16px;
+  z-index: 190;
+  color: var(--text);
+}
+.debug-toggle {
+  background: rgba(255,255,255,0.08);
+  color: var(--text);
+  border: 1px solid rgba(255,255,255,0.15);
+  border-radius: 10px;
+  padding: 8px 10px;
+  cursor: pointer;
+  font-weight: 700;
+}
+.debug-toggle:hover { background: rgba(255,255,255,0.12); }
+.debug-panel {
+  margin-top: 10px;
+  width: min(420px, 90vw);
+  max-height: 50vh;
+  background: rgba(11, 15, 20, 0.96);
+  border: 1px solid rgba(255,255,255,0.12);
+  border-radius: 12px;
+  box-shadow: 0 16px 32px rgba(0,0,0,0.4);
+  display: flex;
+  flex-direction: column;
+}
+.debug-header {
+  padding: 10px 12px;
+  font-weight: 700;
+  border-bottom: 1px solid rgba(255,255,255,0.08);
+}
+.debug-body {
+  padding: 8px 12px;
+  overflow: auto;
+  display: grid;
+  gap: 6px;
+}
+.debug-row {
+  display: grid;
+  grid-template-columns: auto auto 1fr;
+  gap: 8px;
+  align-items: baseline;
+  font-size: 12px;
+  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
+}
+.debug-row .debug-label { font-weight: 700; }
+.debug-row .debug-details { color: var(--subtle); font-weight: 400; }
+.debug-row.level-error { color: #ffaaaa; }
+.debug-row.level-warn { color: #ffd27f; }
+.debug-row.level-info { color: #9bd4ff; }
+.debug-row.level-debug { color: #b3c4ff; }
+.debug-empty { color: var(--subtle); font-size: 12px; }
+
+.link-btn {
+  background: none;
+  border: none;
+  color: var(--accent);
+  cursor: pointer;
+  font-weight: 700;
+  text-decoration: underline;
+  padding: 0 2px;
+}
+.link-btn:hover { color: #bfe3ff; }
diff --git a/frontend/src/main.tsx b/frontend/src/main.tsx
index ce7ad38..42e929d 100644
--- a/frontend/src/main.tsx
+++ b/frontend/src/main.tsx
@@ -3,11 +3,12 @@ import ReactDOM from "react-dom/client";
 import { BrowserRouter } from "react-router-dom";
 import App from "./App";
 import "./index.css";
+import { config } from "./config";
 
 ReactDOM.createRoot(document.getElementById("root")!).render(
   <React.StrictMode>
-    <BrowserRouter basename={import.meta.env.BASE_URL}>
+    <BrowserRouter basename={config.basePath}>
       <App />
     </BrowserRouter>
   </React.StrictMode>
-);
\ No newline at end of file
+);
diff --git a/frontend/src/pages/ShowsPage.tsx b/frontend/src/pages/ShowsPage.tsx
index f2996fb..a5ec223 100644
--- a/frontend/src/pages/ShowsPage.tsx
+++ b/frontend/src/pages/ShowsPage.tsx
@@ -1,20 +1,10 @@
-import { useEffect, useMemo, useState, useRef } from "react";
+import React, { useEffect, useMemo, useState, useRef } from "react";
 import { useNavigate } from "react-router-dom";
-import { API_ENDPOINT } from "../api/endpoint";
-import { logApiError, logApiRequest, logApiResponse } from "../utils/logger";
+import { logApiError } from "../utils/logger";
+import { toastError, toastInfo } from "../utils/toastBus";
+import { fetchShows, postCurrentEpisode } from "../api/watchparty";
+import type { ShowItem } from "../api/watchparty";
 
-type Show = {
-    id: number;
-    ep_num: number;
-    ep_title: string;
-    season_name: string;
-    start_time: string;
-    playback_length: string;
-    date_created: string;
-};
-
-const GET_URL = API_ENDPOINT.v1.SHOWS;
-const POST_URL = API_ENDPOINT.v1.CURRENT;
 const REDIRECT_DELAY_S = 3;
 
 const HHMM = /^(\d{1,2}):([0-5]\d)$/;
@@ -36,7 +26,7 @@ function toHHMM(v: string): string | null {
 }
 
 export default function ShowsPage() {
-    const [shows, setShows] = useState<Show[]>([]);
+    const [shows, setShows] = useState<ShowItem[]>([]);
     const [loading, setLoading] = useState(true);
     const [posting, setPosting] = useState(false);
     const [error, setError] = useState<string | null>(null);
@@ -68,28 +58,27 @@ export default function ShowsPage() {
         return v; // fallback (unexpected format)
     }
 
+    const loadShows = React.useCallback(async () => {
+        setError(null);
+        try {
+            setLoading(true);
+            const data = await fetchShows();
+            data.sort((a, b) => a.id - b.id);   // ASC
+            setShows(data);
+        } catch (e: unknown) {
+            const msg = e instanceof Error ? e.message : "番組一覧の取得に失敗しました。";
+            setError(msg);
+            logApiError("fetch shows", e);
+            toastError("番組一覧の取得に失敗しました", msg);
+        } finally {
+            setLoading(false);
+        }
+    }, []);
+
     // 一覧取得
     useEffect(() => {
-        let cancelled = false;
-        (async () => {
-            try {
-                setLoading(true);
-                logApiRequest("fetch shows", { url: GET_URL });
-                const res = await fetch(GET_URL, { cache: "no-store" });
-                logApiResponse("fetch shows", res);
-                if (!res.ok) throw new Error(`HTTP ${res.status}`);
-                const data = (await res.json()) as Show[];
-                data.sort((a, b) => a.id - b.id);   // ASC
-                setShows(data);
-            } catch (e: any) {
-                if (!cancelled) setError(e.message || "番組一覧の取得に失敗しました。");
-                logApiError("fetch shows", e);
-            } finally {
-                if (!cancelled) setLoading(false);
-            }
-        })();
-        return () => { cancelled = true; };
-    }, []);
+        loadShows().catch(() => {});
+    }, [loadShows]);
     useEffect(() => {
         return () => {
             if (redirectTid.current) {
@@ -107,7 +96,7 @@ export default function ShowsPage() {
         const selected = shows.find(s => s.id === selectedId);
         if (!selected) { setError("選択中のエピソードが見つかりません。"); return; }
 
-        const payload: any = { id: selectedId };
+        const payload: { id: number; start_time?: string } = { id: selectedId };
 
         if (startTime.trim()) {
             const normalized = toHHMMSS(startTime);
@@ -119,14 +108,8 @@ export default function ShowsPage() {
 
         try {
             setPosting(true);
-            logApiRequest("set current episode", { url: POST_URL, payload });
-            const res = await fetch(POST_URL, {
-                method: "POST",
-                headers: { "Content-Type": "application/json" },
-                body: JSON.stringify(payload),
-            });
-            logApiResponse("set current episode", res);
-            if (!res.ok) throw new Error(`POST 失敗 (${res.status})`);
+            await postCurrentEpisode(payload);
+            toastInfo("現在のエピソードを設定しました");
             setRedirectIn(REDIRECT_DELAY_S);
             const start = Date.now();
             redirectTid.current = window.setInterval(() => {
@@ -134,9 +117,11 @@ export default function ShowsPage() {
                 if (left <= 0) { window.clearInterval(redirectTid.current!); navigate("/", { replace: true }); }
                 else setRedirectIn(left);
             }, 250);
-        } catch (e: any) {
-            setError(e.message || "現在のエピソード設定に失敗しました。");
+        } catch (e: unknown) {
+            const msg = e instanceof Error ? e.message : "現在のエピソード設定に失敗しました。";
+            setError(msg);
             logApiError("set current episode", e);
+            toastError("現在のエピソード設定に失敗しました", msg);
         } finally {
             setPosting(false);
         }
@@ -150,7 +135,14 @@ export default function ShowsPage() {
             </p>
 
             {loading && <div className="subtle">読み込み中…</div>}
-            {error && <div className="timer-status" style={{ color: "#f88" }}>{error}</div>}
+            {error && (
+                <div className="timer-status" style={{ color: "#f88" }}>
+                    {error}{" "}
+                    <button className="link-btn" onClick={() => loadShows()}>
+                        再試行
+                    </button>
+                </div>
+            )}
 
             {!loading && shows.length === 0 && <div className="subtle">エピソードがありません。</div>}
 
diff --git a/frontend/src/test/setup.ts b/frontend/src/test/setup.ts
new file mode 100644
index 0000000..4c98ceb
--- /dev/null
+++ b/frontend/src/test/setup.ts
@@ -0,0 +1,27 @@
+// Vite SSR helpers stubbed for Vitest with rolldown build.
+// Avoids ReferenceError: __vite_ssr_exportName__ when running unit tests.
+(globalThis as any).__vite_ssr_exportName__ = (mod: unknown, key: unknown, value: unknown) => {
+    if (!(globalThis as any).__debug_ssr__) {
+        (globalThis as any).__debug_ssr__ = [];
+    }
+    const logArr = (globalThis as any).__debug_ssr__ as unknown[];
+    if (logArr.length < 5) {
+        logArr.push([typeof mod, typeof key, typeof value]);
+        if (logArr.length === 5) {
+            // eslint-disable-next-line no-console
+            console.log("ssr helper calls", logArr);
+        }
+    }
+    if (mod && typeof mod === "object" && typeof key === "string") {
+        (mod as Record<string, unknown>)[key] = value;
+        return value;
+    }
+    if (typeof mod === "string" && typeof key === "function") {
+        (globalThis as Record<string, unknown>)[mod] = key();
+        return value;
+    }
+    if (typeof key === "string") {
+        (globalThis as Record<string, unknown>)[key] = typeof value === "function" ? value() : value;
+    }
+    return value;
+};
diff --git a/frontend/src/utils/logger.ts b/frontend/src/utils/logger.ts
index 41783aa..8bbc4e3 100644
--- a/frontend/src/utils/logger.ts
+++ b/frontend/src/utils/logger.ts
@@ -1,24 +1,53 @@
-const envMode = (import.meta.env.VITE_APP_MODE || import.meta.env.MODE || "").toString().toLowerCase();
-const enabled = envMode === "debug";
+import { config } from "../config";
+
+const envMode = config.mode;
+const enabled = config.isDebug;
 const prefix = "[watch-party]";
+const MAX_LOGS = 50;
 
-type Level = "debug" | "info" | "warn" | "error";
+export type Level = "debug" | "info" | "warn" | "error";
 
-function write(level: Level, ...args: unknown[]) {
+export type DebugLog = {
+    id: number;
+    ts: number;
+    level: Level;
+    label: string;
+    details?: unknown;
+};
+
+let nextId = 1;
+const buffer: DebugLog[] = [];
+const subscribers = new Set<(logs: DebugLog[]) => void>();
+
+function publish(entry: DebugLog) {
+    buffer.push(entry);
+    if (buffer.length > MAX_LOGS) buffer.splice(0, buffer.length - MAX_LOGS);
+    subscribers.forEach((fn) => fn([...buffer]));
+}
+
+function write(level: Level, label: string, details?: unknown) {
     if (!enabled) return;
     const fn = console[level] || console.log;
-    fn(prefix, ...args);
+    if (details === undefined) fn(prefix, label);
+    else fn(prefix, label, details);
+    publish({ id: nextId++, ts: Date.now(), level, label, details });
 }
 
 export const logger = {
     enabled,
     mode: envMode,
-    debug: (...args: unknown[]) => write("debug", ...args),
-    info: (...args: unknown[]) => write("info", ...args),
-    warn: (...args: unknown[]) => write("warn", ...args),
-    error: (...args: unknown[]) => write("error", ...args),
+    debug: (label: string, details?: unknown) => write("debug", label, details),
+    info: (label: string, details?: unknown) => write("info", label, details),
+    warn: (label: string, details?: unknown) => write("warn", label, details),
+    error: (label: string, details?: unknown) => write("error", label, details),
 };
 
+export function subscribeLogs(fn: (logs: DebugLog[]) => void) {
+    subscribers.add(fn);
+    fn([...buffer]);
+    return () => { subscribers.delete(fn); };
+}
+
 export function logApiRequest(label: string, details?: Record<string, unknown>) {
     if (!enabled) return;
     logger.debug(`${label}: request`, details || {});
diff --git a/frontend/src/utils/time.test.ts b/frontend/src/utils/time.test.ts
new file mode 100644
index 0000000..7a30f50
--- /dev/null
+++ b/frontend/src/utils/time.test.ts
@@ -0,0 +1,28 @@
+import { describe, expect, it } from "vitest";
+import { parseDurationToSeconds, parseStartTime } from "./time";
+
+describe("parseStartTime", () => {
+    it("parses HH:MM and HH:MM:SS", () => {
+        expect(parseStartTime("09:15")).toEqual({ hour: 9, minute: 15, second: 0 });
+        expect(parseStartTime("21:05:30")).toEqual({ hour: 21, minute: 5, second: 30 });
+    });
+
+    it("returns null for invalid", () => {
+        expect(parseStartTime("99:00")).toBeNull();
+        expect(parseStartTime("10:61")).toBeNull();
+        expect(parseStartTime("abc")).toBeNull();
+        expect(parseStartTime(undefined)).toBeNull();
+    });
+});
+
+describe("parseDurationToSeconds", () => {
+    it("parses MM:SS and HH:MM:SS", () => {
+        expect(parseDurationToSeconds("05:30")).toBe(330);
+        expect(parseDurationToSeconds("1:02:03")).toBe(3723);
+    });
+
+    it("uses fallback on bad input", () => {
+        expect(parseDurationToSeconds("bad", 10)).toBe(10);
+        expect(parseDurationToSeconds(undefined, 99)).toBe(99);
+    });
+});
diff --git a/frontend/src/utils/time.ts b/frontend/src/utils/time.ts
new file mode 100644
index 0000000..fbb7194
--- /dev/null
+++ b/frontend/src/utils/time.ts
@@ -0,0 +1,28 @@
+export type ParsedStart = { hour: number; minute: number; second: number };
+
+const START_RE = /^(\d{1,2}):([0-5]\d)(?::([0-5]\d))?$/;
+
+export function parseStartTime(s?: string): ParsedStart | null {
+    if (!s || typeof s !== "string") return null;
+    const m = START_RE.exec(s.trim());
+    if (!m) return null;
+    const hour = Number(m[1]);
+    const minute = Number(m[2]);
+    const second = m[3] ? Number(m[3]) : 0;
+    if (hour < 0 || hour > 23) return null;
+    return { hour, minute, second };
+}
+
+export function parseDurationToSeconds(s?: string, fallback = 0): number {
+    if (!s || typeof s !== "string") return fallback;
+    const parts = s.trim().split(":").map(Number);
+    if (parts.some((n) => Number.isNaN(n) || n < 0)) return fallback;
+    if (parts.length === 2) {
+        const [mm, ss] = parts;
+        return mm * 60 + ss;
+    } else if (parts.length === 3) {
+        const [hh, mm, ss] = parts;
+        return hh * 3600 + mm * 60 + ss;
+    }
+    return fallback;
+}
diff --git a/frontend/src/utils/toastBus.ts b/frontend/src/utils/toastBus.ts
new file mode 100644
index 0000000..fa49afe
--- /dev/null
+++ b/frontend/src/utils/toastBus.ts
@@ -0,0 +1,52 @@
+export type ToastLevel = "info" | "warn" | "error";
+
+export type Toast = {
+    id: number;
+    level: ToastLevel;
+    message: string;
+    detail?: string;
+    expiresAt?: number;
+};
+
+const listeners = new Set<(toasts: Toast[]) => void>();
+const queue: Toast[] = [];
+let nextId = 1;
+const MAX_TOASTS = 4;
+
+function emitUpdate() {
+    listeners.forEach((fn) => fn([...queue]));
+}
+
+export function pushToast(toast: Omit<Toast, "id">) {
+    const entry: Toast = {
+        id: nextId++,
+        ...toast,
+    };
+    queue.push(entry);
+    if (queue.length > MAX_TOASTS) queue.shift();
+    emitUpdate();
+}
+
+export function dismissToast(id: number) {
+    const idx = queue.findIndex((t) => t.id === id);
+    if (idx >= 0) {
+        queue.splice(idx, 1);
+        emitUpdate();
+    }
+}
+
+export function subscribeToasts(fn: (toasts: Toast[]) => void) {
+    listeners.add(fn);
+    fn([...queue]);
+    return () => { listeners.delete(fn); };
+}
+
+export function toastError(message: string, detail?: string) {
+    const expiresAt = Date.now() + 7000;
+    pushToast({ level: "error", message, detail, expiresAt });
+}
+
+export function toastInfo(message: string, detail?: string) {
+    const expiresAt = Date.now() + 4000;
+    pushToast({ level: "info", message, detail, expiresAt });
+}
diff --git a/frontend/tsconfig.vitest.json b/frontend/tsconfig.vitest.json
new file mode 100644
index 0000000..e5a292e
--- /dev/null
+++ b/frontend/tsconfig.vitest.json
@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "module": "CommonJS",
+    "verbatimModuleSyntax": false
+  }
+}
diff --git a/frontend/vitest.config.ts b/frontend/vitest.config.ts
new file mode 100644
index 0000000..3a33031
--- /dev/null
+++ b/frontend/vitest.config.ts
@@ -0,0 +1,14 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+    test: {
+        environment: "node",
+        globals: true,
+        dir: "src",
+        setupFiles: "./src/test/setup.ts",
+        deps: {
+            registerNodeLoader: true,
+        },
+        tsconfig: "tsconfig.vitest.json",
+    },
+});