feat(app): Prompt tab shows both query and response in brief format

The Prompt tab now renders the full AI response using magazine extraction
(extractMagazineSections) to create nicely formatted tiles. The user's
query appears as the hero headline, and the response is broken into
styled sections — same as the Brief tab but always available.

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

packages/app/src/pages/ChatPage.vue

@@ -70,6 +70,7 @@
               :panel-magazine-hero-image="panelMagazineHeroImage"
               :panel-title="panelTitle"
               :panel-query="panelQuery"
+              :panel-response-text="panelResponseText"
               @close="closePanel"
             />
           </ErrorBoundary>
@@ -401,6 +402,7 @@ const {
   panelMagazineHeroImage,
   panelTitle,
   panelQuery,
+  panelResponseText,
   contentType,
   activeTab,
   availableTabs,