Fix mount idle fidget animations playing fully without interruption

Fidgets were stuttering because normal animation updates immediately overrode them.
Now tracks active fidget and prevents normal animation updates until fidget completes.

Changes:
- Added mountActiveFidget_ to track currently playing fidget animation
- Check fidget completion using getAnimationState before allowing normal updates
- Only trigger new fidgets when no fidget is active
- Cancel active fidget on movement
- Expanded fidget search criteria: duration up to 3000ms, ID range 1-20
- Added debug logging to show discovered fidgets and when they complete

include/rendering/renderer.hpp

@@ -330,6 +330,7 @@ private:
     MountAnimSet mountAnims_;  // Cached animation IDs for current mount
     float mountIdleFidgetTimer_ = 0.0f;  // Timer for random idle fidgets
     float mountIdleSoundTimer_ = 0.0f;   // Timer for ambient idle sounds
+    uint32_t mountActiveFidget_ = 0;     // Currently playing fidget animation ID (0 = none)
     bool taxiFlight_ = false;
 
     bool terrainEnabled = true;