v3.9.2 – Icon visible in both light and dark themes

Fix

Icon now visible in dark mode. The HA frontend always requests icon.png regardless of theme — it never loads dark_icon.png.

The icon now uses a dark rounded background with white AUDAC logo (matching the official AUDAC app style), which works on both light and dark HA themes.

Logos remain transparent with black/white variants for use outside the integration card.