Fix WMO wall collision, normal mapping, POM backfill, and M2/WMO rendering performance

- Fix MOPY flag check (0x08 not 0x01) for proper wall collision detection
- Cap MAX_PUSH to PLAYER_RADIUS to prevent gradual clip-through
- Fix WMO doodad quaternion component ordering (X/Y swap)
- Linear normal map strength blend in shader for smooth slider control
- Enable shadow sampling for interior WMO groups (covered outdoor areas)
- Backfill deferred normal/height maps after streaming with descriptor rebind
- M2: prepareRender only iterates animated instances, bone dirty flag
- M2: remove worker thread VMA allocation, skip unready bone instances
- WMO: persistent visibility vectors, sequential culling
- Add FSR EASU/RCAS shaders

include/ui/game_screen.hpp

@@ -116,6 +116,10 @@ private:
     float pendingNormalMapStrength = 0.8f;  // 0.0-2.0
     bool pendingPOM = true;             // on by default
     int pendingPOMQuality = 1;          // 0=Low(16), 1=Medium(32), 2=High(64)
+    bool pendingFSR = false;
+    int pendingFSRQuality = 0;          // 0=UltraQuality, 1=Quality, 2=Balanced, 3=Performance
+    float pendingFSRSharpness = 0.5f;
+    bool fsrSettingsApplied_ = false;
 
     // UI element transparency (0.0 = fully transparent, 1.0 = fully opaque)
     float uiOpacity_ = 0.65f;