Improve movement, crouching, and add M2 animation

Movement:
- Fix speed controls: Shift=sprint (28), normal run (14), Ctrl=walk (5)
- Reduce character height for doorway clearance (eye height 1.2)
- Add working crouch (C or X key) with smooth transition (eye height 0.6)
- Jump to stand up from crouch

M2 Animation:
- Add animation time tracking per M2 instance
- Add procedural swaying animation in vertex shader
- Update animation each frame for vegetation movement

include/rendering/camera_controller.hpp

@@ -85,7 +85,9 @@ private:
     // Gravity / grounding
     float verticalVelocity = 0.0f;
     bool grounded = false;
-    float eyeHeight = 1.8f;  // WoW human eye height (~2 yard tall character)
+    static constexpr float STAND_EYE_HEIGHT = 1.2f;  // Standing eye height
+    static constexpr float CROUCH_EYE_HEIGHT = 0.6f; // Crouching eye height
+    float eyeHeight = STAND_EYE_HEIGHT;
     float lastGroundZ = 0.0f;  // Last known ground height (fallback when no terrain)
     static constexpr float GRAVITY = -30.0f;
     static constexpr float JUMP_VELOCITY = 15.0f;
@@ -115,11 +117,12 @@ private:
     // Movement callback
     MovementCallback movementCallback;
 
-    // Movement speeds (scaled up for better feel)
+    // Movement speeds
     bool useWoWSpeed = false;
-    static constexpr float WOW_RUN_SPEED = 14.0f;   // Double base WoW speed for responsiveness
-    static constexpr float WOW_WALK_SPEED = 5.0f;   // Walk (hold Shift)
-    static constexpr float WOW_BACK_SPEED = 9.0f;   // Backpedal
+    static constexpr float WOW_RUN_SPEED = 14.0f;    // Normal run (WASD)
+    static constexpr float WOW_SPRINT_SPEED = 28.0f; // Sprint (hold Shift)
+    static constexpr float WOW_WALK_SPEED = 5.0f;    // Walk (hold Ctrl)
+    static constexpr float WOW_BACK_SPEED = 9.0f;    // Backpedal
     static constexpr float WOW_GRAVITY = -19.29f;
     static constexpr float WOW_JUMP_VELOCITY = 7.96f;
 

include/rendering/m2_renderer.hpp

@@ -57,6 +57,11 @@ struct M2Instance {
     float scale;
     glm::mat4 modelMatrix;
 
+    // Animation state
+    float animTime = 0.0f;       // Current animation time
+    float animSpeed = 1.0f;      // Animation playback speed
+    uint32_t animId = 0;         // Current animation sequence
+
     void updateModelMatrix();
 };
 
@@ -100,6 +105,12 @@ public:
     uint32_t createInstanceWithMatrix(uint32_t modelId, const glm::mat4& modelMatrix,
                                        const glm::vec3& position);
 
+    /**
+     * Update animation state for all instances
+     * @param deltaTime Time since last frame
+     */
+    void update(float deltaTime);
+
     /**
      * Render all visible instances
      */