fix: improve realtime controls layout and add agent status bar

- Change realtime controls to horizontal layout with fixed height (88px)
- Add orientation prop to VolumeMeter for horizontal/vertical modes
- Create AgentStatusBar component showing mode badge and agent status
- Add agent persistence system for managing agent state across restarts
- Fix bottom sheet dismiss handling to clear state properly
- Remove debug timer from realtime controls

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/server/agents.json

@@ -0,0 +1,9 @@
+[
+  {
+    "id": "bcc0019c-9293-4235-adb7-921f8e7d67eb",
+    "title": "Fix Real-time Footer Spacing",
+    "sessionId": "019a1575-706b-73fc-8955-d2c7b524e707",
+    "createdAt": "2025-10-24T09:03:28.577Z",
+    "cwd": "/Users/moboudra/dev/voice-dev"
+  }
+]