Migrate Propeller chat components to Sailwind

[pglevy]

Overview

Migrate the chat components from the Propeller component library (src/components/chat/) into Sailwind. These components provide a complete chat UI experience and should be adapted to follow Sailwind's SAIL-exact parameter conventions and two-layer architecture.

Components to Migrate

Converted to sub-issues

Migration Considerations

• Adapt component APIs to use SAIL-exact UPPERCASE parameter values where applicable
• Follow Sailwind's two-layer architecture (SAIL API layer → Tailwind implementation layer)
• Use Lucide React icons (no emoji)
• Map Propeller's shadcn/Radix patterns to Sailwind equivalents
• Ensure stories are created/migrated for each component
• Maintain accessibility (ARIA roles, labels, explicit backgrounds per Propeller's a11y patterns)

Status

• UserMessage: 🟡 In progress on migrate-user-message branch (not pushed yet)
• All other components: 🔴 Not started

[kuynkank]

I can pick up

• ChatInput
• ChatPanel
• ChatFeedback
• ChatConfirmation

[pglevy]

I can pick up

• ChatInput
• ChatPanel
• ChatFeedback
• ChatConfirmation

Cool, thanks, @kuynkank! I've assigned parent to you for now for visibility, but we divide it up as needed.