Group contribution prompts into compact panels

[hamzamerzic]

Summary

• cap contribution prompts and source-chat review cards at a readable desktop width
• present several questions or prepared contributions as one headed panel with compact internal rows
• keep every decision, dismissal, and contribution action independent
• bound multi-item review panels to one scroll area and preserve the phone-width layout
• show the aggregate change total in compact rows while keeping complete file details behind Details

Context

This is a focused follow-up to #250, which introduced the source-chat contribution review card and noted that a chat would normally have zero or one prepared record. Real working chats can accumulate several independent contributions, and one agent question can carry several contribution decisions. The existing surfaces then stretch across a wide transcript and read as a wall of separate cards.

This keeps the existing review and publication trust boundaries unchanged; it only improves how those decisions are presented.

Testing

• 1,991 frontend library checks passed
• 63 frontend hook checks passed
• production frontend build passed
• rendered against a live three-item state at desktop and phone-sized viewports