fix: disable terminal UI, fix hydration mismatch

- Remove terminal button from UnifiedTopBar and TerminalDrawer rendering
  Terminal feature disabled until proper node-pty + xterm.js integration
- Fix ChatListPanel hydration mismatch: chatListOpenRaw/chatListWidth
  used window-dependent initializers causing SSR/client divergence
- Improve TerminalInstance for future use: stable useEffect deps,
  ANSI rendering via ansi-to-react, focus management
- Clear CLAUDECODE env var in terminal-manager to allow nested sessions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "codepilot",
-  "version": "0.34.1",
+  "version": "0.34.2",
   "private": true,
   "workspaces": [
     "apps/*",