🎨 Palette: Add keyboard shortcuts for primary actions

[Shin5hi]

💡 What:

Implemented a global keyboard shortcut (Ctrl+Enter and Meta+Enter) to trigger the primary action button, along with visual <kbd> hints on the button itself. To support these nested elements, the loading state saving mechanism was refactored from saving textContent to saving childNodes.

🎯 Why:

To provide a more intuitive and accessible experience for keyboard and power users, reducing reliance on mouse navigation for primary interactions.

📸 Before/After:

Before: The action button only displayed "Click Me (Accessible)" and required a mouse click or standard Tab/Space navigation.
After: The button explicitly hints the shortcut "Click Me (Accessible) Ctrl+Enter". The keyboard shortcut immediately focuses and clicks the button, and the DOM restoration cleanly restores the nested elements.

♿ Accessibility:

• Added aria-keyshortcuts="Control+Enter Meta+Enter" to the button to explicitly declare the shortcut to screen readers.
• Added visual <kbd> elements to implicitly declare the shortcut to sighted users.
• Ensured the shortcut handler triggers preventDefault() and actively focus()es the button to ensure screen readers track the active interaction context.

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PR created automatically by Jules for task 9205861562448097540 started by @Shin5hi

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