teknium1 ee4008431a fix: stop terminal border flashing with steady cursor and TUI spinner widget ...

Cherry-picked and improved from PR #470 (fixes #464).

Problem: On Ubuntu 24.04 with ghostty + tmux, the prompt input box
border lines flash due to cursor blink and raw spinner terminal writes
conflicting with prompt_toolkit's rendering.

Changes:
- cli.py: Add CursorShape.BLOCK to Application() to disable cursor blink
- cli.py: Add thinking_callback + spinner_widget in TUI layout so
  thinking status displays as a proper prompt_toolkit widget instead of
  raw terminal writes that conflict with the TUI renderer
- run_agent.py: Add thinking_callback parameter to AIAgent; when set,
  uses the callback instead of KawaiiSpinner for thinking display

What was NOT changed (preserving existing behavior):
- agent/display.py: Untouched. KawaiiSpinner _write() stdout capture,
  _animate() logic, and 0.12s frame interval all preserved. This
  protects subagent stdout redirection and keeps smooth animations
  for non-CLI contexts (gateway, batch runner).
- Original emoji spinner types (brain/sparkle/pulse/moon/star) preserved
  for all non-CLI contexts.

Fixes from original PR #470:
- CursorShape.STEADY_BLOCK -> CursorShape.BLOCK (STEADY_BLOCK doesn't
  exist in prompt_toolkit 3.0.52)
- Removed duplicate self._spinner_text = '' line
- Removed redundant nested if-checks

Tested: 2706 tests pass, interactive CLI verified via tmux.

2026-03-09 23:26:43 -07:00

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