🎨 Palette: Add keyboard shortcut and hints to main action button

[Shin5hi]

💡 What: Added a global keyboard shortcut (Ctrl/Cmd + Enter) to trigger the primary action button and visually indicated the shortcut using <kbd> tags. Refactored the loading state logic to preserve nested DOM nodes instead of overwriting .textContent. Updated CSP hash to reflect changes.
🎯 Why: Enhances power-user experience and accessibility by allowing users to complete the primary form action without reaching for their mouse.
📸 Before/After: Before, the button said "Click Me (Accessible)" without shortcut bindings. Now, it displays "Click Me Ctrl/Cmd + Enter" with functional cross-platform bindings.
♿ Accessibility: Added aria-keyshortcuts="Control+Enter Meta+Enter" to the button so screen readers correctly broadcast the availability of the shortcut to assistive tech users.

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PR created automatically by Jules for task 3433610020540615552 started by @Shin5hi

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