🎨 Palette: Enhance NotepadScreen UX and Accessibility

[TargetMisser]

💡 What: Added screen-reader accessibility labels and roles to the icon-only Clear and Save buttons in NotepadScreen. Also added disabled states and dimmed opacity when the text is already empty or already saved to prevent unnecessary interactions.
🎯 Why: Icon-only buttons without ARIA/accessibility labels are invisible to screen readers, making the app inaccessible to visually impaired users. Furthermore, active buttons that shouldn't be clicked (like "Clear" when empty) can cause confusion or unintended behavior.
📸 Before/After: Visual change: The "Clear" button now dims when the notepad is empty.
♿ Accessibility: Added accessible={true}, accessibilityRole="button", and accessibilityLabel using existing translations.

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PR created automatically by Jules for task 14337315238053168331 started by @TargetMisser

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Project	Deployment	Actions	Updated (UTC)
flight-work-app	Ready	Preview, Comment, Open in v0	Apr 25, 2026 1:26am