fix(ui): fix profile switching and improve UX

- Add key prop to ProfileEditor to force remount on profile change

- Reset editorHasChanges on discard confirmation

- Add text-white to destructive dialog button

- Change OpenRouter default model to claude-opus-4.5

src/api/services/provider-presets.ts

@@ -38,7 +38,7 @@ export const PROVIDER_PRESETS: ProviderPreset[] = [
     description: '349+ models from OpenAI, Anthropic, Google, Meta',
     baseUrl: OPENROUTER_BASE_URL,
     defaultProfileName: 'openrouter',
-    defaultModel: 'anthropic/claude-sonnet-4',
+    defaultModel: 'anthropic/claude-opus-4.5',
     apiKeyPlaceholder: 'sk-or-...',
     apiKeyHint: 'Get your API key at openrouter.ai/keys',
     category: 'recommended',

ui/src/components/shared/confirm-dialog.tsx

@@ -39,7 +39,7 @@ export function ConfirmDialog({
           <AlertDialogCancel onClick={onCancel}>Cancel</AlertDialogCancel>
           <AlertDialogAction
             onClick={onConfirm}
-            className={variant === 'destructive' ? 'bg-red-600 hover:bg-red-700' : ''}
+            className={variant === 'destructive' ? 'bg-red-600 hover:bg-red-700 text-white' : ''}
           >
             {confirmText}
           </AlertDialogAction>

ui/src/lib/provider-presets.ts

@@ -34,7 +34,7 @@ export const PROVIDER_PRESETS: ProviderPreset[] = [
     badge: '349+ models',
     featured: true,
     icon: '/icons/openrouter.svg',
-    defaultModel: 'anthropic/claude-sonnet-4',
+    defaultModel: 'anthropic/claude-opus-4.5',
     requiresApiKey: true,
     apiKeyPlaceholder: 'sk-or-...',
     apiKeyHint: 'Get your API key at openrouter.ai/keys',

ui/src/pages/api.tsx

@@ -220,6 +220,7 @@ export function ApiPage() {
         <div className="flex-1 flex flex-col min-w-0">
           {selectedProfileData ? (
             <ProfileEditor
+              key={selectedProfileData.name}
               profileName={selectedProfileData.name}
               onDelete={() => setDeleteConfirm(selectedProfileData.name)}
               onHasChangesUpdate={setEditorHasChanges}
@@ -266,6 +267,7 @@ export function ApiPage() {
         confirmText="Discard & Switch"
         variant="destructive"
         onConfirm={() => {
+          setEditorHasChanges(false);
           setSelectedProfile(pendingSwitch);
           setPendingSwitch(null);
         }}