🎨 Palette: Add keyboard shortcut and preserve nested hints in state transitions

[Shin5hi]

💡 What

Added a global keyboard shortcut (Cmd/Ctrl + Enter) to trigger the main "Click Me" button. The button now displays a visual hint (<kbd>⌘/Ctrl+Enter</kbd>), and the underlying script listens for these keystrokes, focusing and clicking the button.

🎯 Why

Keyboard shortcuts dramatically improve efficiency for power users and are essential for robust keyboard accessibility. The visual hint helps discoverability. Furthermore, the previous implementation of state restoration during the async loading sequence (using textContent) would strip out nested HTML structures like <kbd>. This PR safely preserves child nodes via replaceChildren without using innerHTML.

📸 Before/After

(Visuals verified via Playwright screenshot. The button text now includes the <kbd>⌘/Ctrl+Enter</kbd> hint and accurately returns to this state after a successful async action).

♿ Accessibility

• Implements aria-keyshortcuts="Control+Enter Meta+Enter" on the button for screen reader support.
• Enhances keyboard navigation by bringing programmatic focus to the element when triggered.

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PR created automatically by Jules for task 2001672804434034578 started by @Shin5hi

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