fix(app): harden brief extraction and default to fastest model

- Default chatCollapsed to true so PromptIndex shows on load
- Default AI model to claude-haiku-4.5 for faster responses
- Fix extractMagazineSections to handle numbered/bullet bold lists
  without markdown headings (e.g. "1. **Title** — content")
- Fix "For deeper coverage" stripping for bold-formatted text
- Expand hasMagazine detection with more financial/news keywords

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

packages/app/src/composables/useAI.ts

@@ -62,7 +62,7 @@ ${podcastContext}`
 
 const activeProvider = ref<Provider>('claude')
 
-const activeModel = ref('claude-sonnet-4')
+const activeModel = ref('claude-haiku-4.5')
 
 const availableProviders = computed(() => {
   const providers: { id: Provider; name: string; models: { id: string; name: string }[] }[] = [
@@ -70,9 +70,9 @@ const availableProviders = computed(() => {
       id: 'claude',
       name: 'Claude (Max)',
       models: [
+        { id: 'claude-haiku-4.5', name: 'Claude 4.5 Haiku' },
         { id: 'claude-sonnet-4', name: 'Claude Sonnet 4' },
         { id: 'claude-opus-4', name: 'Claude Opus 4' },
-        { id: 'claude-haiku-3.5', name: 'Claude 3.5 Haiku' },
       ],
     },
   ]