Add water footstep splashes and reduce lake wave amplitude

- Play WaterFootstep splash sounds when wading in shallow water
- Spawn foot splash particles at water surface on each water footstep
- Reduce inland water wave amplitude from 0.18 to 0.08 for calmer lakes

include/rendering/swim_effects.hpp

@@ -24,6 +24,7 @@ public:
     void update(const Camera& camera, const CameraController& cc,
                 const WaterRenderer& water, float deltaTime);
     void render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet);
+    void spawnFootSplash(const glm::vec3& footPos, float waterH);
 
 private:
     struct Particle {

src/rendering/renderer.cpp

@@ -2590,7 +2590,20 @@ void Renderer::update(float deltaTime) {
             float animDurationMs = 0.0f;
             if (characterRenderer->getAnimationState(characterInstanceId, animId, animTimeMs, animDurationMs) &&
                 shouldTriggerFootstepEvent(animId, animTimeMs, animDurationMs)) {
-                footstepManager->playFootstep(resolveFootstepSurface(), cameraController->isSprinting());
+                auto surface = resolveFootstepSurface();
+                footstepManager->playFootstep(surface, cameraController->isSprinting());
+                // Play additional splash sound and spawn foot splash particles when wading
+                if (surface == audio::FootstepSurface::WATER) {
+                    if (movementSoundManager) {
+                        movementSoundManager->playWaterFootstep(audio::MovementSoundManager::CharacterSize::MEDIUM);
+                    }
+                    if (swimEffects && waterRenderer) {
+                        auto wh = waterRenderer->getWaterHeightAt(characterPosition.x, characterPosition.y);
+                        if (wh) {
+                            swimEffects->spawnFootSplash(characterPosition, *wh);
+                        }
+                    }
+                }
             }
             mountFootstepNormInitialized = false;
         } else {

src/rendering/swim_effects.cpp

@@ -345,6 +345,27 @@ void SwimEffects::spawnRipple(const glm::vec3& pos, const glm::vec3& moveDir, fl
     ripples.push_back(p);
 }
 
+void SwimEffects::spawnFootSplash(const glm::vec3& footPos, float waterH) {
+    // Small burst of splash droplets at foot position (for wading)
+    constexpr int splashCount = 5;
+    for (int i = 0; i < splashCount; ++i) {
+        if (static_cast<int>(ripples.size()) >= MAX_RIPPLE_PARTICLES) break;
+        Particle p;
+        float ox = randFloat(-0.4f, 0.4f);
+        float oy = randFloat(-0.4f, 0.4f);
+        p.position = glm::vec3(footPos.x + ox, footPos.y + oy, waterH + 0.1f);
+        // Small upward spray in random horizontal direction
+        float angle = randFloat(0.0f, 6.2832f);
+        float speed = randFloat(0.8f, 2.0f);
+        p.velocity = glm::vec3(std::cos(angle) * speed, std::sin(angle) * speed, randFloat(1.0f, 2.5f));
+        p.lifetime = 0.0f;
+        p.maxLifetime = randFloat(0.3f, 0.6f);
+        p.size = randFloat(2.0f, 4.0f);
+        p.alpha = randFloat(0.4f, 0.7f);
+        ripples.push_back(p);
+    }
+}
+
 void SwimEffects::spawnBubble(const glm::vec3& pos, float /*waterH*/) {
     if (static_cast<int>(bubbles.size()) >= MAX_BUBBLE_PARTICLES) return;
 

src/rendering/water_renderer.cpp

@@ -782,7 +782,7 @@ void WaterRenderer::render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet,
         uint8_t basicType = (surface.liquidType == 0) ? 0 : ((surface.liquidType - 1) % 4);
         // WMO water gets no wave displacement — prevents visible slosh at
         // geometry edges (bridges, docks) where water is far below the surface.
-        float waveAmp = isWmoWater ? 0.0f : (basicType == 1 ? 0.35f : 0.18f);
+        float waveAmp = isWmoWater ? 0.0f : (basicType == 1 ? 0.35f : 0.08f);
         float waveFreq = canalProfile ? 0.35f : (basicType == 1 ? 0.20f : 0.30f);
         float waveSpeed = canalProfile ? 1.00f : (basicType == 1 ? 1.20f : 1.40f);