🎨 Palette: Add keyboard shortcut hints to action button

[Shin5hi]

💡 What:
Added global keyboard shortcut (Ctrl+Enter or Meta+Enter) to trigger the primary action button. Visually added <kbd> hints directly into the button text to surface the shortcut to the user. Updated state restoration mechanics (using node preservation over textContent) to protect structural <kbd> UI hints during the button's loading state.

🎯 Why:
Power users and keyboard navigators expect standard interaction paths to be faster. Showing the shortcut visually and reacting to it anywhere on the page provides an intuitive micro-UX efficiency boost.

📸 Before/After:
Before: The button only read Click Me (Accessible). Users had to physically tab to it or click it to initiate.
After: The button displays Click Me (Accessible) Ctrl+Enter using standard browser styling for <kbd>, and pressing Ctrl+Enter globally triggers it while maintaining focus.

♿ Accessibility:

• Added aria-keyshortcuts="Control+Enter Meta+Enter" to the button for screen reader awareness.
• Forced .focus() onto the button when triggered via shortcut to visibly update the tab navigation state to the user.
• Utilized Array.from(element.childNodes) and replaceChildren to safely preserve visual <kbd> elements without relying on innerHTML exposing XSS vectors.

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PR created automatically by Jules for task 10549548407696732323 started by @Shin5hi

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