feat: Add realtime git status updates via WebSocket

- Add file watcher on .git directory in terminal server
- Broadcast git-change events to connected clients
- Frontend auto-refreshes when changes detected
- Visual indicator shows realtime connection status

server/services/terminal.ts

@@ -1,4 +1,6 @@
 import { spawn, type IPty } from '@skitee3000/bun-pty'
+import { watch, type FSWatcher } from 'fs'
+import { join } from 'path'
 import { PORT_TERMINAL, WORKING_DIR, SHELL, SHELL_ARGS, DEFAULT_SESSION_ID, MAX_BUFFER_LINES } from '../config'
 
 interface TerminalSession {
@@ -239,3 +241,66 @@ export function broadcastClaudeStatus(status: ClaudeStatus, tool?: string) {
 
   console.log(`[Terminal] Claude status broadcast: ${status}${tool ? ` (${tool})` : ''} → ${clientCount} clients`)
 }
+
+// Git watcher
+let gitWatcher: FSWatcher | null = null
+let gitDebounceTimer: Timer | null = null
+const GIT_DEBOUNCE_MS = 300
+
+function broadcastGitChange() {
+  const message = JSON.stringify({
+    type: 'git-change',
+    timestamp: Date.now()
+  })
+
+  let clientCount = 0
+  for (const [, session] of sessions) {
+    for (const ws of session.clients) {
+      try {
+        ws.send(message)
+        clientCount++
+      } catch {
+        // Client disconnected
+      }
+    }
+  }
+
+  if (clientCount > 0) {
+    console.log(`[Git] Change detected → ${clientCount} clients notified`)
+  }
+}
+
+export function startGitWatcher() {
+  const gitDir = join(WORKING_DIR, '.git')
+
+  try {
+    // Watch .git directory recursively
+    gitWatcher = watch(gitDir, { recursive: true }, (eventType, filename) => {
+      // Ignore some noisy files
+      if (filename?.includes('FETCH_HEAD') || filename?.includes('gc.log')) {
+        return
+      }
+
+      // Debounce to avoid flooding
+      if (gitDebounceTimer) {
+        clearTimeout(gitDebounceTimer)
+      }
+
+      gitDebounceTimer = setTimeout(() => {
+        broadcastGitChange()
+      }, GIT_DEBOUNCE_MS)
+    })
+
+    console.log(`[Git] Watching ${gitDir} for changes`)
+  } catch (e: any) {
+    console.error(`[Git] Failed to watch .git directory: ${e.message}`)
+  }
+}
+
+export function stopGitWatcher() {
+  if (gitWatcher) {
+    gitWatcher.close()
+    gitWatcher = null
+    console.log('[Git] Watcher stopped')
+  }
+}