🎨 Palette: Add tooltips and accessibility labels for camera metrics

[manupawickramasinghe]

💡 What: Added tooltips and dynamic content descriptions to the Bitrate and Frame Time metrics in the camera preview. Also fixed duplicate XML attributes in fragment_camera.xml.
🎯 Why: Raw numbers (e.g. "500kB/s", "33ms") are cryptic to new users and lack context for screen readers. Duplicate attributes were causing build failures.
♿ Accessibility:

• Added tooltipText for "Current streaming bitrate" and "Frame processing latency".
• Added dynamic contentDescription updates (e.g., "Bitrate: 500 kilobytes per second") for screen readers.
• Made metric views focusable and long-clickable for better discoverability.
• Fixed invalid duplicate android:labelFor attributes.

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PR created automatically by Jules for task 4336062276193203756 started by @manupawickramasinghe

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