🎨 Palette: Add keyboard shortcut hint to action button

[Shin5hi]

💡 What:
Added a Cmd/Ctrl + K keyboard shortcut to trigger the main action button. Added a visual <kbd> element inside the button to hint at this shortcut. Modified the state transition logic to save and restore the DOM node structure natively rather than wiping the text content, safely keeping the button label intact. Added the shortcut to aria-keyshortcuts for assistive technologies.

🎯 Why:
Enables faster operation for keyboard users and power users without forcing them to manually tab or mouse to the primary action button.

📸 Before/After:

• Before: Button just read "Click Me (Accessible)", user had to click or tab to it.
• After: Button reads "Click Me ⌘K". Pressing Cmd/Ctrl + K safely focuses the button and executes the click handler, displaying the loading sequence while preserving the nested <kbd> tag.

♿ Accessibility:

• Included the aria-keyshortcuts="Control+K Meta+K" attribute so screen readers announce the shortcut correctly.
• Ensured that when the shortcut is triggered, focus is brought immediately to the button via actionBtn.focus().
• Implemented state preservation using replaceChildren(...) instead of innerHTML to eliminate XSS risks while preserving the <kbd> structure.

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PR created automatically by Jules for task 12045119918194339082 started by @Shin5hi

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