- Split composer into AI zone (primary accent) and data actions zone (neutral)
- Move Attach/Generate to labeled footer bar below textarea (left/right aligned)
- Add info icon with HoverCard (hover preview) + Popover (pinned click) showing identical keyboard shortcuts content using shadcn HoverCard to fix theme inconsistency vs Tooltip
- Expose imperative triggerRef on ImagePicker for keyboard shortcut access
- Wire TooltipProvider in root layout; install shadcn kbd and hover-card
- Unauthenticated state shows locked CTA with real sign-in button weight
- Add behavioral contract tests for footer bar, info trigger, and zone layout
