🎨 Palette: Add dynamic labels and help tooltips to main action buttons

[acebytes]

💡 What: Added dynamic labels ("Scanning...", "Cleaning...") and .help() tooltips to the Scan and Clean buttons in ContentView.
🎯 Why: To provide immediate feedback during asynchronous operations and explain why the Clean button might be disabled (e.g., when no items are selected), improving overall accessibility and user understanding.
📸 Before/After: Visual feedback is now present for disabled states and async operations.
♿ Accessibility: Improved VoiceOver and keyboard navigation support by adding descriptive .help() text that acts as tooltips and accessible hints.

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PR created automatically by Jules for task 8955199430156060339 started by @acebytes

[google-labs-jules]

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[acebytes]

Duplicate of #259 — same dynamic label + .help() tooltips on the Scan/Clean buttons in ContentView. Keeping #259 as canonical.

[google-labs-jules]

Duplicate of #259 — same dynamic label + .help() tooltips on the Scan/Clean buttons in ContentView. Keeping #259 as canonical.

Understood. Acknowledging that this work is a duplicate and stopping work on this task.