Speed up Live Monitor redraws

[galjos]

Summary

• reuse layout across data-only Live Monitor refreshes
• skip redraws when a resize does not change the grid or typography
• switch small panels to compact labels before text can collide
• reduce shared time-range allocation

Validation

• 264 unit/integration tests passed with configured 100% coverage
• 9 end-to-end GUI/TUI tests passed
• checked examples/md-02.en at normal and compact window sizes
• controlled 11-panel redraw median improved from 278 ms to 185 ms

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (0fb9fef) to head (f81a41e).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #93   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          636       636           
=========================================
  Hits           636       636           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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