feat: add default AI profile selection to settings view

- Introduced default AI profile management in the settings view, allowing users to select a default profile for new features.
- Updated the Add Feature dialog to utilize the selected AI profile, setting default model and thinking level based on the chosen profile.
- Enhanced the Feature Defaults section to display and manage the default AI profile, including a dropdown for selection and relevant information display.

apps/ui/src/components/views/settings-view.tsx

@@ -43,6 +43,9 @@ export function SettingsView() {
     setDefaultPlanningMode,
     defaultRequirePlanApproval,
     setDefaultRequirePlanApproval,
+    defaultAIProfileId,
+    setDefaultAIProfileId,
+    aiProfiles,
   } = useAppStore();
 
   // Convert electron Project to settings-view Project type
@@ -127,12 +130,15 @@ export function SettingsView() {
             useWorktrees={useWorktrees}
             defaultPlanningMode={defaultPlanningMode}
             defaultRequirePlanApproval={defaultRequirePlanApproval}
+            defaultAIProfileId={defaultAIProfileId}
+            aiProfiles={aiProfiles}
             onShowProfilesOnlyChange={setShowProfilesOnly}
             onDefaultSkipTestsChange={setDefaultSkipTests}
             onEnableDependencyBlockingChange={setEnableDependencyBlocking}
             onUseWorktreesChange={setUseWorktrees}
             onDefaultPlanningModeChange={setDefaultPlanningMode}
             onDefaultRequirePlanApprovalChange={setDefaultRequirePlanApproval}
+            onDefaultAIProfileIdChange={setDefaultAIProfileId}
           />
         );
       case "danger":