feat(tui): animate interrupt confirmation - #42602

What

Flash the interrupt hint when the first Escape press arms confirmation. The copy changes immediately to esc again to interrupt, then settles to the theme's warning color after 220 ms.

How

• Uses the existing TUI animation clock for an interruptible one-shot tint.
• Derives the flash from text.feedback.warning.default with theme.decrease(..., 2), with no hard-coded hue.
• Skips directly to the settled warning color when animations are disabled.

Scope

Interrupt behavior, keybindings, and theme tokens are unchanged.

Testing

• bun typecheck in packages/tui
• bun run test test/cli/tui/prompt-interrupt-status.test.tsx in packages/tui
• bunx prettier --check packages/tui/src/component/prompt/index.tsx packages/tui/test/cli/tui/prompt-interrupt-status.test.tsx
• Push hook: full workspace bun turbo typecheck --concurrency=3
• Real PTY verification of replay, disabled animations, theme changes, and clean exit

Demo

Production component rendered through a temporary local fixture.