feat: Display default model in dropdowns and consolidate Git settings menu (#135)

* types: add commitMessageModel to DesktopSettings

* store: add commitMessageModel state and fetch logic

* lib: implement persistence for commitMessageModel setting

* ui: create GitSettings component for model selection

* ui: add Git section to OpenChamber settings sidebar

* ui: register GitSectionContent in OpenChamberPage

* server: use commitMessageModel setting for AI generation

* tauri: sanitize commitMessageModel in settings commands

* tauri: use commitMessageModel for desktop message generation

* build: update lockfile and package configuration

* refactor(openchamber): improve default model parsing with fallback logic

* feat(openchamber): improve model selection fallback logic

* refactor: move worktree settings into git section

* refactor(openchamber): merge worktree into git section

* refactor[worktree]: simplify empty state layout

* revert: rollback bun.lock and package.json to main

* feat(git): restrict model selection to OpenCode provider

packages/ui/src/lib/persistence.ts

@@ -47,6 +47,11 @@ const persistToLocalStorage = (settings: DesktopSettings) => {
   } else {
     localStorage.removeItem('pinnedDirectories');
   }
+  if (settings.commitMessageModel) {
+    localStorage.setItem('commitMessageModel', settings.commitMessageModel);
+  } else {
+    localStorage.removeItem('commitMessageModel');
+  }
 };
 
 type PersistApi = {
@@ -261,6 +266,9 @@ const sanitizeWebSettings = (payload: unknown): DesktopSettings | null => {
   if (typeof candidate.autoCreateWorktree === 'boolean') {
     result.autoCreateWorktree = candidate.autoCreateWorktree;
   }
+  if (typeof candidate.commitMessageModel === 'string' && candidate.commitMessageModel.length > 0) {
+    result.commitMessageModel = candidate.commitMessageModel;
+  }
   if (typeof candidate.queueModeEnabled === 'boolean') {
     result.queueModeEnabled = candidate.queueModeEnabled;
   }