Fix mobile assistant chat UX for INB-162

[cursor]

Improves the mobile assistant chat experience by collapsing the Search Inbox card by default, increasing response section spacing, and making inline email/archive cards more informative and actionable on smaller screens. Includes focused regression coverage for the updated inline email behavior.

  

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
inbox-zero	Ignored		Mar 24, 2026 2:04pm

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[cubic-dev-ai]

cubic analysis

No issues found across 4 files

Linked issue analysis

Linked issue: INB-162: Mobile app chat design / UX improvements

Status	Acceptance criteria	Notes
✅	Search Inbox should be closed by default	CollapsibleToolCard default initialOpen = false; SearchInbox uses it
✅	Remove / make compact the card around Search Inbox while closed	Added compactWhenClosed prop and compact styles when closed
✅	Increase padding between response sections (so sections have more spacing)	Response spacing classes updated to add gap between children
✅	Increase padding so 'Must Handle Now' is not too close to text above	InlineEmailList and InlineEmailCard margins/padding increased
✅	Inline email/archive cards should be actionable on mobile (archive available inline as a button)	Archive Button present with onClick handler for inline archive
✅	Inline email cards should show more email info (sender, subject, snippet, date) on mobile	Displays meta.from, meta.subject, meta.snippet and formatted date
✅	Add focused regression coverage for updated inline email behavior	New test asserts metadata and Archive button presence