WordPress Media Library picker uses default purple theme instead of Woo colors #15599

Description

The WordPress Media Library picker screen uses the default Material 3 purple color scheme instead of the Woo app theme colors. The toolbar and status bar appear purple instead of the expected white/light Woo theme.

This happens because the media picker library (org.wordpress.android.mediapicker) uses its own theme that doesn't inherit from WooTheme.

Steps to Reproduce

1. Go to Products → tap a product → Images → Add image → Choose from device
2. The Media Library picker opens with a purple toolbar

Screenshot

Expected Behavior

The toolbar should use the standard Woo app colors (white/light background with dark text), consistent with the rest of the app.