feat: enhance settings view and feature defaults management

- Introduced default feature model settings in the settings view, allowing users to specify the default AI model for new feature cards.
- Updated navigation to include a direct link to model defaults in the settings menu.
- Enhanced the Add Feature dialog to utilize the default feature model from the app store.
- Implemented synchronization of the default feature model in settings migration and sync hooks.
- Improved UI components to reflect changes in default settings, ensuring a cohesive user experience.

apps/ui/src/components/views/settings-view/config/navigation.ts

@@ -37,8 +37,8 @@ export const GLOBAL_NAV_GROUPS: NavigationGroup[] = [
   {
     label: 'Model & Prompts',
     items: [
-      { id: 'model-defaults', label: 'Model Defaults', icon: Workflow },
       { id: 'defaults', label: 'Feature Defaults', icon: FlaskConical },
+      { id: 'model-defaults', label: 'Model Defaults', icon: Workflow },
       { id: 'worktrees', label: 'Worktrees', icon: GitBranch },
       { id: 'prompts', label: 'Prompt Customization', icon: MessageSquareText },
       { id: 'api-keys', label: 'API Keys', icon: Key },

apps/ui/src/components/views/settings-view/feature-defaults/feature-defaults-section.tsx

@@ -10,6 +10,7 @@ import {
   ScrollText,
   ShieldCheck,
   FastForward,
+  Cpu,
 } from 'lucide-react';
 import { cn } from '@/lib/utils';
 import {
@@ -19,6 +20,8 @@ import {
   SelectTrigger,
   SelectValue,
 } from '@/components/ui/select';
+import type { PhaseModelEntry } from '@automaker/types';
+import { PhaseModelSelector } from '../model-defaults/phase-model-selector';
 
 type PlanningMode = 'skip' | 'lite' | 'spec' | 'full';
 
@@ -28,11 +31,13 @@ interface FeatureDefaultsSectionProps {
   skipVerificationInAutoMode: boolean;
   defaultPlanningMode: PlanningMode;
   defaultRequirePlanApproval: boolean;
+  defaultFeatureModel: PhaseModelEntry;
   onDefaultSkipTestsChange: (value: boolean) => void;
   onEnableDependencyBlockingChange: (value: boolean) => void;
   onSkipVerificationInAutoModeChange: (value: boolean) => void;
   onDefaultPlanningModeChange: (value: PlanningMode) => void;
   onDefaultRequirePlanApprovalChange: (value: boolean) => void;
+  onDefaultFeatureModelChange: (value: PhaseModelEntry) => void;
 }
 
 export function FeatureDefaultsSection({
@@ -41,11 +46,13 @@ export function FeatureDefaultsSection({
   skipVerificationInAutoMode,
   defaultPlanningMode,
   defaultRequirePlanApproval,
+  defaultFeatureModel,
   onDefaultSkipTestsChange,
   onEnableDependencyBlockingChange,
   onSkipVerificationInAutoModeChange,
   onDefaultPlanningModeChange,
   onDefaultRequirePlanApprovalChange,
+  onDefaultFeatureModelChange,
 }: FeatureDefaultsSectionProps) {
   return (
     <div
@@ -68,6 +75,30 @@ export function FeatureDefaultsSection({
         </p>
       </div>
       <div className="p-6 space-y-5">
+        {/* Default Feature Model Setting */}
+        <div className="group flex items-start space-x-3 p-3 rounded-xl hover:bg-accent/30 transition-colors duration-200 -mx-3">
+          <div className="w-10 h-10 mt-0.5 rounded-xl flex items-center justify-center shrink-0 bg-brand-500/10">
+            <Cpu className="w-5 h-5 text-brand-500" />
+          </div>
+          <div className="flex-1 space-y-2">
+            <div className="flex items-center justify-between">
+              <Label className="text-foreground font-medium">Default Model</Label>
+              <PhaseModelSelector
+                value={defaultFeatureModel}
+                onChange={onDefaultFeatureModelChange}
+                compact
+                align="end"
+              />
+            </div>
+            <p className="text-xs text-muted-foreground/80 leading-relaxed">
+              The default AI model and thinking level used when creating new feature cards.
+            </p>
+          </div>
+        </div>
+
+        {/* Separator */}
+        <div className="border-t border-border/30" />
+
         {/* Planning Mode Default */}
         <div className="group flex items-start space-x-3 p-3 rounded-xl hover:bg-accent/30 transition-colors duration-200 -mx-3">
           <div
@@ -165,12 +196,11 @@ export function FeatureDefaultsSection({
                 </p>
               </div>
             </div>
-            <div className="border-t border-border/30" />
           </>
         )}
 
         {/* Separator */}
-        {defaultPlanningMode === 'skip' && <div className="border-t border-border/30" />}
+        <div className="border-t border-border/30" />
 
         {/* Automated Testing Setting */}
         <div className="group flex items-start space-x-3 p-3 rounded-xl hover:bg-accent/30 transition-colors duration-200 -mx-3">