fix: prevent shortcut editor from creating override when unchanged

[SaKaNa-Y]

Description

Compare edited key against default before saving. Skip writing to
commandShortcuts when the value matches the preset, avoiding the
false "modified" indicator (reset icon) on unchanged shortcuts.

Linked Issues

Additional context

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commit: 014aac2

[Copilot]

Pull request overview

This PR fixes the shortcuts editor UX by avoiding writing a commandShortcuts override when the edited shortcut matches the command’s default keybinding, preventing unchanged shortcuts from being flagged as “modified” (showing the reset icon).

Changes:

• Add a helper to resolve a command’s default keybinding from the commands registry.
• Update shortcut save logic to delete an existing override (or skip writing) when the saved key equals the default.

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