🎨 Palette: Add keyboard shortcuts to primary action

[Shin5hi]

💡 What:
Added a standard Ctrl+K/Cmd+K keyboard shortcut to the primary sample button, allowing immediate non-pointer interaction without layout interruption. Enhanced state saving logic to gracefully preserve complex button childNodes, circumventing XSS-prone innerHTML overrides.

🎯 Why:
Keyboard shortcuts represent a micro-UX enhancement that creates an immediately satisfying and "pro" feel for standard operations. It reduces friction for rapid task completion and provides a complementary navigation mechanism for all users. The refactor of state preservation sets a great precedent for future components scaling with nested DOM content.

📸 Before/After:
Before: Button read "Click Me (Accessible)"
After: Button reads "Click Me Ctrl+K" natively preserving structure when swapping loading spinner state.

♿ Accessibility:
The button properly exposes the new keystroke logic through the aria-keyshortcuts="Control+k Meta+k" attribute, enabling assistive technologies to discover the shortcut. Programmatic focus management allows screen readers to remain fully aware of the user's execution context.

Also updated .jules/palette.md to persist learnings regarding safe layout updates without sacrificing security standards.

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PR created automatically by Jules for task 6807554731042087188 started by @Shin5hi

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