- Introduce linesCountRaw state to capture raw input values
- Add handleLinesCountChange callback with 300ms debounce delay
- Reuse existing filterDebounceRef pattern with linesCountDebounceRef
- Guard against zero/negative values by enforcing minimum of 100 lines
- Update Select component to use debounced value and new handler
- Add comprehensive test coverage for debounce behavior and input validation
Fixes TASK-BUG-09: Typing '500' in the Lines field now fires single API
request instead of three (one per keystroke). This mirrors the existing
debounce pattern used for the filter input.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>