Bug Description

TUI thinking spinner animation shows static Braille pattern dots instead of rotating/animating. The spinner should cycle through different Braille characters but remains frozen on one frame.

Environment

• OpenCode Version: 1.3.13
• Terminal: Ghostty (also tested on iTerm2 - same issue)
• OS: macOS

Steps to Reproduce

1. Start OpenCode TUI
2. Enable thinking (模型开启思考功能)
3. Submit a prompt that triggers thinking
4. Observe the spinner in the bottom-left corner (next to Esc key)
5. The spinner shows static dots instead of animating

Expected Behavior

The spinner should animate/rotate through the Braille pattern (e.g., ⠋ → ⠙ → ⠹ → ⠸ → ⠼ → ⠴ → ⠦ → ⠧ → ⠇ → ⠏ → ⠟)

Actual Behavior

The spinner displays static dots (⠄) and does not animate/rotate.

Additional Notes

• This appears to be an OpenTUI rendering issue
• The thinking content still generates correctly, only the spinner animation is broken
• No errors in logs related to this issue