feat: Add tree file view for git status, AgentBar dock, and settings updates

- Add StatusTree component with collapsible directory hierarchy for staged/unstaged/untracked files
- Replace flat file lists in GitPage with tree view showing file type icons and git status badges
- Add AgentBar arc dock with per-agent terminal frame and voice modal
- Update ejecutor settings with hooks for claude-status reporting

.claude/ui.json

@@ -5,5 +5,5 @@
   "gradient": "linear-gradient(135deg, #6366f1, #8b5cf6)",
   "terminalBg": "#0f0a1a",
   "terminalBorder": "#6366f1",
-  "enabled": true
+  "enabled": false
 }