Summary

• Replace vector silhouette drawables with actual product photo PNGs for all supported Apple/Beats device models (170+ images across 5 DPI buckets)
• Wire new icons to device classes and PodDevice.Model enum entries with tint removal for full-color rendering
• Move signal quality indicator from below the title to the top-right corner of the popup card, always visible when data is available
• Fix notification small icon to use monochrome drawable instead of color PNG

Test plan

• Trigger connection popup for dual-pod devices (AirPods, Beats) — verify product photo icons render in full color
• Trigger connection popup for single-pod devices (AirPods Max, Beats headphones) — verify icons render correctly
• Verify signal quality indicator appears in top-right corner with icon + percentage text
• Check notification tray — small icon should be monochrome silhouette, not solid rectangle
• Verify dashboard cards and widget still display device icons correctly