🎨 Palette: Add keyboard shortcuts with visual hints

[Shin5hi]

💡 What

Added a global keyboard shortcut (⌘K / Ctrl+K) to trigger the primary action button, along with a visual <kbd> hint and aria-keyshortcuts attribute. Refactored state preservation to safely keep nested elements in the DOM instead of overwriting with textContent.

🎯 Why

Keyboard shortcuts allow power users and keyboard-reliant users to interact with key functionality much more quickly without needing to manually tab to the button or use a mouse. The visual hint helps discoverability.

📸 Before/After

Before: The button simply said "Click Me (Accessible)" and required manual focus/clicking.
After: The button includes the <kbd>⌘K</kbd> text, and pressing Meta+K/Ctrl+K will immediately focus and trigger the loading state on the button.

♿ Accessibility

Added the aria-keyshortcuts="Control+K Meta+K" attribute to explicitly inform assistive technologies of the available shortcut. Programmatically focusing the button ensures keyboard users' focus state is smoothly tracked when they use the shortcut. Maintained XSS safety by avoiding innerHTML.

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PR created automatically by Jules for task 18029664910573799579 started by @Shin5hi

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