Merge develop → main (AR stability + depth estimation for non-LiDAR)

[doranteseduardo]

Changes

• Fixed iOS memory leaks (ARFrame retention)
• Fixed thread deadlocks in AR session
• Added monocular depth estimation for non-LiDAR devices (e.g., iPhone XR, 11)
• Enhanced AR hit testing with ML-based depth
• Prevented particle emitter crash

Key feature: Depth on non-LiDAR devices

Depth estimation now works on devices without LiDAR using the Depth Anything v2 CoreML model.

• More accurate AR object placement across all devices
• Automatic fallback when LiDAR isn’t available
• Real-time depth maps from the camera feed

Breaking / noteworthy changes

• iOS binary size: +~50MB (CoreML model)
• iOS memory usage: +~50MB during depth estimation

Migration

• Backward compatible — no code changes required
• Please validate on non-LiDAR devices to confirm behaviour and quality