Thread composer full-screen expand control for multi-line drafts.
- Dev server running (
pnpm run dev --host 127.0.0.1 --port 4173) - Any existing thread is open and send controls are enabled
- Light theme and dark theme both available from the appearance switcher
- In light theme, type or paste at least six lines into the composer.
- Confirm the expand button appears in the composer input area.
- Click the expand button.
- Confirm the composer fills the viewport, keeps the draft text, and leaves model/skill/thinking/send controls usable at the bottom.
- Click the collapse button.
- Confirm the composer returns to its normal inline size with the draft still intact.
- Switch to dark theme and repeat steps 1-6.
- Short drafts do not show the expand control.
- Long or overflowing drafts show an icon-only expand control.
- Full-screen mode uses the same draft state and submit controls as inline mode.
- Full-screen and inline states are readable in light theme and dark theme.
- Clear the draft from the composer.