feat(cli): TUI component architecture — status bars, message list, input bar

- Split monolithic app.tsx into composable components:
  - TopBar: connection indicator (●/○), gateway URL, model name, conversation ID
  - BottomBar: cwd, git branch, token usage
  - MessageList: timestamped messages, tool call indicators, thinking display
  - InputBar: context-aware prompt with streaming/disconnect states
- Extract socket logic into useSocket hook with typed events
- Extract git/cwd info into useGitInfo hook
- Quiet disconnect: single indicator instead of error flood
- Add @mosaic/types dependency for typed Socket.IO events
- Add PRD and task tracking docs

Tasks: TUI-001 through TUI-007 (Wave 1)

packages/cli/package.json

@@ -24,12 +24,13 @@
     "@mosaic/mosaic": "workspace:^",
     "@mosaic/prdy": "workspace:^",
     "@mosaic/quality-rails": "workspace:^",
+    "@mosaic/types": "workspace:^",
+    "commander": "^13.0.0",
     "ink": "^5.0.0",
-    "ink-text-input": "^6.0.0",
     "ink-spinner": "^5.0.0",
+    "ink-text-input": "^6.0.0",
     "react": "^18.3.0",
-    "socket.io-client": "^4.8.0",
-    "commander": "^13.0.0"
+    "socket.io-client": "^4.8.0"
   },
   "devDependencies": {
     "@types/node": "^22.0.0",