* fix(powermenu): close on escape key and deduplicate action shortcuts
- Centralize Escape key handling in PowerMenuContent via closeRequested signal,
cancelling any active hold and enabling Esc to close both modal and popout variants.
- Remove redundant Keys.onEscapePressed wrapper in PowerMenuPopout.
- Extract handleActionShortcut and handleKeyRelease helpers to eliminate ~50 lines
of duplicated action shortcut dispatch between list and grid navigation.
* fix(powermenu): drop duplicate Keys.onEscapePressed handler
- Remove redundant Keys.onEscapePressed in PowerMenuContent, keeping Escape
handling unified under Keys.onPressed to preserve isAutoRepeat and
committedAction guards.
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