refactor(app): consolidate seeds into single conversation

All 15 seed prompts now load as one conversation ("Content Showcase")
instead of 15 separate ones. /seed collapses chat to show PromptIndex
so users can quickly pick any prompt to see its content surface.

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

packages/app/src/__tests__/fixtures/seedPrompts.ts

@@ -438,30 +438,31 @@ One of each is all you need to start.`,
 /**
  * Convert seed prompts to the .dev/chats.json conversation format.
  */
-export function seedPromptsToConversations(): Record<string, {
+/** Build a single conversation with all seed prompts as sequential messages. */
+export function seedPromptsToConversation(): {
   id: string
   title: string
   messages: { id: string; role: string; content: string; timestamp: number }[]
   createdAt: number
   updatedAt: number
-}> {
-  const conversations: Record<string, any> = {}
-  const baseTime = 1772488800000 // Stable base timestamp
+} {
+  const baseTime = 1772488800000
+  const messages: { id: string; role: string; content: string; timestamp: number }[] = []
 
   for (let i = 0; i < seedPrompts.length; i++) {
     const seed = seedPrompts[i]
     const ts = baseTime + i * 60000
-    conversations[seed.id] = {
-      id: seed.id,
-      title: seed.userQuery.slice(0, 60),
-      messages: [
-        { id: `${seed.id}-q`, role: 'user', content: seed.userQuery, timestamp: ts },
-        { id: `${seed.id}-a`, role: 'assistant', content: seed.assistantResponse, timestamp: ts + 3000 },
-      ],
-      createdAt: ts,
-      updatedAt: ts + 3000,
-    }
+    messages.push(
+      { id: `${seed.id}-q`, role: 'user', content: seed.userQuery, timestamp: ts },
+      { id: `${seed.id}-a`, role: 'assistant', content: seed.assistantResponse, timestamp: ts + 3000 },
+    )
   }
 
-  return conversations
+  return {
+    id: 'seed-all',
+    title: 'Content Showcase',
+    messages,
+    createdAt: baseTime,
+    updatedAt: baseTime + seedPrompts.length * 60000,
+  }
 }

packages/app/src/components/chat/ChatWindow.vue

@@ -332,12 +332,10 @@ async function handleSend(text: string, images: ImageAttachment[] = []) {
 
   if (trimmed === '/seed') {
     await chatStore.loadSeedChats()
-    // Switch to first seed conversation and open history
-    const firstSeed = chatStore.conversationList.find(c => c.id.startsWith('seed-'))
-    if (firstSeed) {
-      chatStore.setActiveConversation(firstSeed.id)
-    }
-    chatStore.showHistory = true
+    // loadSeedChats already switches to the seed conversation
+    // Collapse chat so user sees PromptIndex for quick picking
+    chatStore.chatCollapsed = true
+    chatStore.showHistory = false
     return
   }
 

packages/app/src/stores/chat.ts

@@ -393,34 +393,27 @@ export const useChatStore = defineStore('chat', () => {
     return siblings
   }
 
-  /** Load seed conversations from fixture index */
+  /** Load all seed prompts as a single conversation */
   async function loadSeedChats(): Promise<number> {
-    let seedConversations: Map<string, Conversation>
     try {
-      const { seedPromptsToConversations } = await import('@/__tests__/fixtures/seedPrompts')
-      const raw = seedPromptsToConversations()
-      seedConversations = new Map(Object.entries(raw)) as Map<string, Conversation>
+      const { seedPromptsToConversation } = await import('@/__tests__/fixtures/seedPrompts')
+      const conv = seedPromptsToConversation() as Conversation
+
+      if (conversations.value.has(conv.id)) {
+        // Already loaded — just switch to it
+        activeConversationId.value = conv.id
+        return 0
+      }
+
+      const merged = new Map(conversations.value)
+      merged.set(conv.id, conv)
+      conversations.value = merged
+      activeConversationId.value = conv.id
+      immediateIDBSave(conv)
+      return conv.messages.length / 2 // number of prompt/response pairs
     } catch {
       return 0
     }
-
-    // Build a new Map to guarantee Vue reactivity triggers
-    const merged = new Map(conversations.value)
-    let added = 0
-    for (const [id, conv] of seedConversations) {
-      if (!merged.has(id)) {
-        merged.set(id, conv)
-        immediateIDBSave(conv)
-        added++
-      }
-    }
-    if (added > 0) {
-      conversations.value = merged
-      if (!activeConversationId.value) {
-        activeConversationId.value = [...seedConversations.keys()][0] ?? null
-      }
-    }
-    return added
   }
 
   return {