fix(options): defer typed spinbox updates

[kmnhan]

Summary

• Defer typed numeric settings changes until the user presses Enter or moves focus.
• Apply the rule to direct and nested spin boxes at the shared settings dialog seam.
• Add a regression test that checks every settings spin box.

Root cause

The settings dialog saved each valueChanged signal and then refreshed all controls. Qt keyboard tracking emitted this signal after each typed character. The refresh interrupted entry before the user could type the complete value.

User impact

Users can type complete ktool and other numeric settings values. Spin-box buttons, arrow keys, and mouse-wheel changes still apply immediately.

Validation

• uv run ruff format --check src/erlab/interactive/_options/ui.py tests/interactive/test_options.py
• uv run ruff check src/erlab/interactive/_options/ui.py tests/interactive/test_options.py
• QT_QPA_PLATFORM=offscreen uv run pytest -q tests/interactive/test_options.py with PyQt6: 61 passed
• QT_API=pyside6 QT_QPA_PLATFORM=offscreen uv run pytest -q tests/interactive/test_options.py: 61 passed
• git diff --check

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.65%. Comparing base (fb81071) to head (6b973ee).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #519   +/-   ##
=======================================
  Coverage   91.65%   91.65%           
=======================================
  Files         247      247           
  Lines       94783    94787    +4     
  Branches    15882    15884    +2     
=======================================
+ Hits        86875    86881    +6     
+ Misses       4590     4589    -1     
+ Partials     3318     3317    -1     

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