🎨 Palette: Improve accessibility of camera metrics

[manupawickramasinghe]

This PR enhances the accessibility and discoverability of the camera performance metrics (Frame Time and Bitrate).

Changes:

1. Tooltips: Added android:tooltipText to the ftFeedback (Frame Time) and qual_feedback (Bitrate) TextViews. This helps users understand what these numbers represent.
2. Dynamic Content Descriptions: Updated CameraFragment.kt to programmatically set the contentDescription of these TextViews when their values change. Instead of hearing "33ms", screen reader users will now hear "33 milliseconds latency".
3. Code Cleanup: Removed duplicate android:importantForAccessibility and android:labelFor attributes found in fragment_camera.xml during the process.

Why:
Previously, these metrics were just raw numbers without labels, making them confusing for new users and less accessible for screen reader users. This small polish aligns with the "Palette" philosophy of adding delightful micro-UX improvements.

Verification:

• Ran ./gradlew assembleDebug successfully.
• Verified that contentDescription is set using the valid context from the BroadcastReceiver.

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PR created automatically by Jules for task 10999488797425543971 started by @manupawickramasinghe

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