🎨 Palette: Add keyboard shortcuts for prompt submission

[EffortlessSteven]

💡 What
Added Ctrl+Enter / Cmd+Enter keyboard shortcuts to all prompt textareas in the browser examples to quickly submit generation requests.

🎯 Why
Users previously had to move their mouse to click "Generate Text" or "Start Streaming" after typing their prompt, breaking their flow. Adding standard Ctrl+Enter submission creates a more seamless, keyboard-friendly workflow.

📸 Before/After
Before: Prompt labels were plain text, users had to manually click buttons to submit.
After: Prompt labels now display a visual <kbd>Ctrl+Enter</kbd> hint, and the textareas support keyboard submission.

♿ Accessibility

• Added aria-keyshortcuts="Control+Enter" to the textarea elements.
• Hid the visual <kbd> hints from screen readers using aria-hidden="true" to prevent redundant/confusing announcements, as screen readers will read the aria-keyshortcuts attribute on the focused element instead.
• Used semantic <kbd> tags for the visual hints.

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PR created automatically by Jules for task 8075223044291004170 started by @EffortlessSteven

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