Blinking terminal cursor

[bedro96]

What to build

With the cursor/line model in place (#22), render a visible blinking cursor at the tracked cursor position in the terminal output view, so interactive CLIs (e.g. GitHub Copilot CLI) show a proper cursor instead of a static end-of-buffer caret. The cursor should blink on a standard interval and sit at the current cursor column/row, updating as output and redraws move it.

Acceptance criteria

• A blinking cursor is drawn at the current cursor position in the terminal view
• The cursor position tracks the model from In-place line redraw — carriage return + erase controls #22 (moves with CR, cursor-column moves, and appended text)
• Blink toggles on a reasonable interval and stops/hides when the session disconnects or output is cleared
• No regression to text rendering, colors, or scrolling
• Cursor-position logic is covered by unit tests where feasible
• ./run-tests.sh passes

Blocked by

• In-place line redraw — carriage return + erase controls #22