Persona preview UI — display + edit persona card

[Punkte]

What to build

A screen shown after processing completes that summarises the extracted persona card in readable form and lets the user correct anything before starting the chat.

Acceptance criteria

• Displays: writing style summary, signature expressions, dominant personality traits, nicknames, recurring topics
• Inline editing for at least: signature expressions, nicknames, writing style description
• Edits saved back to personas table via PATCH /conversations/:id/persona
• "Looks good, start chatting" CTA navigates to chat screen
• Mobile-responsive layout

Blocked by

• Persona extraction — sample → LLM extraction → merge → store PersonaCard JSON #5
• Upload + processing UI — drag & drop, format detection, progress screen #8