Add OS theme detection and automatic UI adaptation for main window#5

Draft

Copilot wants to merge 9 commits intomainfrom

copilot/modernize-ui-theme-support

Commits on Nov 22, 2025

Initial plan
Copilot
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Add OS theme detection and support for main window

Copilot
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lsd-techno
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Update README to reflect enhanced OS theme support

Copilot
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lsd-techno
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Refactor theme colors to use named constants for better maintainability

Copilot
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lsd-techno
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Add hex comments to color constants and optimize theme change detection

Copilot
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lsd-techno
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Remove unused static field from IsLightThemeEnabled method

Copilot
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lsd-techno
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Cache theme update delegate to avoid allocations during theme changes

Copilot
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lsd-techno
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Simplify theme update delegate handling

Copilot
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lsd-techno
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Add error handling for event unsubscription in Dispose

Copilot
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lsd-techno
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