Add Timelog: show the timer in the tab title and simplify the code

This is the first commit of the project, at the state that runs on
timelog.minhtrannhat.com.

Changes in this state:
- Remove redundant UI text from the sidebar, timer and insights pages.
- Show the remaining time and tag in the browser tab title while a
  session runs.
- Put the shared record type and the due and end helpers in
  src/shared/record.ts.
- Remove the startup tag migration and the one-time Forest import
  script. The live data does not need them.
- Remove unused CSS, Playwright ignore rules and duplicate helpers.
- Do not track Forest CSV exports, because they contain private data.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

compose.yml

@@ -0,0 +1,36 @@
+services:
+  web:
+    build:
+      context: .
+      dockerfile: Dockerfile.web
+    restart: unless-stopped
+    environment:
+      WEB_PORT: "3000"
+      WEB_HOST: 0.0.0.0
+      API_ORIGIN: http://api:3001
+    ports:
+      - "127.0.0.1:8092:3000"
+    depends_on:
+      - api
+
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile.api
+    restart: unless-stopped
+    environment:
+      API_PORT: "3001"
+      API_HOST: 0.0.0.0
+      DB_PATH: /data/timelog.sqlite
+      PUBLIC_ORIGIN: ${PUBLIC_ORIGIN}
+      GITHUB_CLIENT_ID: ${GITHUB_CLIENT_ID}
+      GITHUB_CLIENT_SECRET: ${GITHUB_CLIENT_SECRET}
+      GITHUB_ALLOWED_ID: ${GITHUB_ALLOWED_ID}
+      VAPID_PUBLIC_KEY: ${VAPID_PUBLIC_KEY}
+      VAPID_PRIVATE_KEY: ${VAPID_PRIVATE_KEY}
+      VAPID_SUBJECT: ${VAPID_SUBJECT}
+    volumes:
+      - timelog_data:/data
+
+volumes:
+  timelog_data: