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]>

src/web-server.ts

@@ -0,0 +1,33 @@
+const port = Number(process.env.WEB_PORT || 3000);
+const apiOrigin = process.env.API_ORIGIN || "http://localhost:3001";
+
+function staticResponse(path: string) {
+  const file = Bun.file(`dist${path}`);
+  return file.exists().then(exists => exists
+    ? new Response(file, { headers: { "Cache-Control": path === "/sw.js" || path === "/index.html" ? "no-cache" : "public, max-age=3600" } })
+    : null);
+}
+
+Bun.serve({
+  port,
+  hostname: process.env.WEB_HOST || "127.0.0.1",
+  async fetch(request) {
+    const url = new URL(request.url);
+    if (url.pathname.startsWith("/api/") || url.pathname.startsWith("/auth/")) {
+      const upstream = new URL(url.pathname + url.search, apiOrigin);
+      const headers = new Headers(request.headers);
+      headers.delete("host");
+      headers.set("X-Forwarded-Host", url.host);
+      headers.set("X-Forwarded-Proto", url.protocol.slice(0, -1));
+      return fetch(upstream, { method: request.method, headers, body: request.body, redirect: "manual" });
+    }
+    const path = decodeURIComponent(url.pathname);
+    if (path.includes("..") || path.includes("\\")) return new Response("Not found", { status: 404 });
+    const requested = path === "/" ? "/index.html" : path;
+    const response = await staticResponse(requested);
+    if (response) return response;
+    if (!requested.includes(".")) return (await staticResponse("/index.html"))!;
+    return new Response("Not found", { status: 404 });
+  },
+});
+console.log(`Timelog web listening on ${port}`);