🎨 Palette: Add keyboard shortcut hint to action button

[Shin5hi]

💡 What:

• Added a Ctrl+Enter / Cmd+Enter keyboard shortcut to trigger the #action-btn.
• Added an aria-keyshortcuts attribute indicating the shortcut.
• Added a visual <kbd> hint inside the button text.
• Refactored the button's loading/restoration state logic to cache and restore childNodes using replaceChildren(), preserving the nested <kbd> HTML structure instead of destroying it with textContent.
• Updated the CSP hash for the modified inline script.
• Documented the learning about preserving DOM structure in .jules/palette.md.

🎯 Why:
Power users expect keyboard shortcuts to speed up common actions without leaving their current workflow. Visual hints make these shortcuts discoverable, while avoiding innerHTML or textContent manipulation during loading states prevents XSS risks and UI degradation.

📸 Before/After:
(Visual changes verified via Playwright screenshot; button now clearly shows <kbd>Ctrl+Enter</kbd>)

♿ Accessibility:

• Follows cross-platform conventions (e.ctrlKey || e.metaKey).
• Explicitly announces the shortcut to screen readers via aria-keyshortcuts="Control+Enter Meta+Enter".
• Uses semantic <kbd> tags for visual styling.

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PR created automatically by Jules for task 1160012210817010914 started by @Shin5hi

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