Replace Alpine frontend with Next.js Claude Activity Dashboard (#7)

Rebuild the bundled web UI as a Next.js (React + TypeScript) static export
implementing the Claude Activity Dashboard design: a left-nav "Control Center"
hub over Runs, Repositories, Agents, Approvals, Git Servers, Activity, and
Shared, styled with the Leeworks design-system tokens (flat, dark, border-led).

The dashboard is a pure client of the existing API (same contract as curl):
the browser prompts for the token once, stores it in localStorage, attaches it
to every call, and renders all API values as React text so agent-authored
strings stay inert. Control actions enqueue a command and poll it to a terminal
state, matching the worker model.

The build output is committed to src/handler/api/static/ so the wheel ships it
and FastAPI serves it same-origin. app.py now mounts the export at "/" after the
API routers (a non-shadowing fallback: unmatched paths 404, no SPA rewrite).
UI-serving tests updated for the export; frontend source lives in frontend/.


Claude-Session: https://claude.ai/code/session_01ATgVWRjFzG8nHEnwgZpJWD

Co-authored-by: Claude <noreply@anthropic.com>

frontend/tsconfig.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "lib": ["dom", "dom.iterable", "ES2020"],
+    "allowJs": false,
+    "skipLibCheck": true,
+    "strict": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "preserve",
+    "incremental": true,
+    "plugins": [{ "name": "next" }],
+    "paths": { "@/*": ["./*"] }
+  },
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
+  "exclude": ["node_modules", "out"]
+}