🎨 Palette: Add keyboard shortcuts to action button

[Shin5hi]

💡 What

Added a keyboard shortcut (Ctrl+Enter or Meta+Enter) to trigger the main accessible action button. Added <kbd> visual hints directly into the button text, and registered a global keyboard listener that properly focuses and clicks the button. Refactored the loading state script to use childNodes and replaceChildren to ensure the nested <kbd> elements are preserved during the loading phase.

🎯 Why

Keyboard shortcuts dramatically improve the UX for power users and keyboard navigators, making the interface feel more responsive and intuitive to interact with without requiring a mouse click.

📸 Before/After

Before: Button read Click Me (Accessible) and required clicking or tabbing and pressing Enter.
After: Button reads Click Me (Ctrl+Enter) and can be triggered anywhere on the page using the shortcut.

♿ Accessibility

• Added aria-keyshortcuts="Control+Enter Meta+Enter" to the button so screen readers can announce the shortcut.
• The global listener calls actionBtn.focus() before clicking, ensuring focus management is preserved and visual focus indicators (outline) trigger, giving the user feedback that the shortcut worked.
• Maintained security by strictly avoiding innerHTML when preserving the nested <kbd> tags.

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PR created automatically by Jules for task 1431195435719655098 started by @Shin5hi

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