[Desktop] Mod UI gaps: PromptHint not drawn, Text color ignored inside Button, dropped pane presses

Claude Code 2.1.295, desktop app (macOS).

1. PromptHint trees aren't drawn. The types say PromptHint is raised on the terminal and desktop, and a hook "draws its own tree". On desktop, a returned tree (Box with Text + Buttons) never appears, and nothing is logged. It validates and renders in claude plugin test.
2. Text color is ignored inside Button. <Button><Text color="success">●</Text> Label</Button> draws the dot in the default color on desktop. It works outside the button.
3. Dropped presses in a mod Pane. The app logs show engine surface: ui_press not handled {"plugin":"…","key":"toggle-log"}, and the same for other button keys, and the clicks do nothing. It looks like a press reaches a stale handle after the pane redraws (the pane redraws about once a minute from state updates).
4. Feature gap: the AbovePrompt band is always inside the app's full-width card. A bare option (no background, fitted to content) would help small status UIs.