- Introduce `Theme` import and pass a cloned `theme` instance to UI helpers (e.g., `render_editable_textarea`).
- Remove direct `Color` usage; UI now derives colors from `Theme` fields for placeholders, selections, ReAct components (thought, action, input, observation, final answer), status badges, operating mode badges, and model info panel.
- Extend `Theme` with new color fields for agent ReAct stages, badge foreground/background, and operating mode colors.
- Update rendering logic to apply these theme colors throughout the TUI (input panel, help text, status lines, model selection UI, etc.).
- Adjust imports to drop unused `Color` references.
vikingowl
083b621b7d