Sync Noctalia widget layout by monitor role

[CollieIsCute]

Summary

• Add a chezmoi-generated Noctalia widget layout file that derives connector-specific coordinates from monitor roles and ratios.
• Preserve existing desktop and lockscreen widget settings while avoiding committed connector names or runtime state.
• Document that Noctalia GUI widget edits must be folded back into the template or cleared from state.

Verification

• chezmoi execute-template < home/dot_config/noctalia/20-widgets.generated.toml.tmpl
• chezmoi apply -v /home/collie/.config/noctalia/20-widgets.generated.toml
• chezmoi diff /home/collie/.config/noctalia/20-widgets.generated.toml
• noctalia config validate /home/collie/.config/noctalia
• noctalia config validate /home/collie/.config/noctalia/20-widgets.generated.toml
• Mock 1K, 2K, and 2K scale 1.25 monitor layouts using the same ratio math