🎨 Palette: Add keyboard shortcuts for generating text

[EffortlessSteven]

💡 What: Added Ctrl+Enter keyboard shortcut to all textareas to trigger the generation process. Added visual hints and aria-keyshortcuts attributes.
🎯 Why: Improves power user experience and keyboard accessibility by reducing the need to tab to or click the "Generate" button.
📸 Before/After: N/A
♿ Accessibility: Added aria-keyshortcuts to textareas and visual hints using <kbd aria-hidden="true"> to ensure screen readers properly announce the shortcut without redundant reading of the visual text.

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PR created automatically by Jules for task 7130246165382215772 started by @EffortlessSteven

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