fix: animation stutter, resolution crash, memory cap, spell tooltip hints, GO collision

- Animation stutter: skip playAnimation(Run) for the local player in the
  server movement callback — the player renderer state machine already manages
  it; resetting animTime on every movement packet caused visible stutter
- Resolution crash: reorder swapchain recreation so old swapchain is only
  destroyed after confirming the new build succeeded; add null-swapchain
  guard in beginFrame to survive the retry window
- Memory cap: reduce cache budget from 80% uncapped to 50% hard-capped at
  16 GB to prevent excessive RAM use on high-memory systems
- Spell tooltip: suppress "Drag to action bar / Double-click to cast" hints
  when the tooltip is shown from the action bar (showUsageHints=false)
- M2 collision: add watermelon/melon/squash/gourd to foliage (no-collision);
  exclude chair/bench/stool/seat/throne from smallSolidProp so invisible chair
  bounding boxes no longer trap the player

src/rendering/m2_renderer.cpp

@@ -979,8 +979,16 @@ bool M2Renderer::loadModel(const pipeline::M2Model& model, uint32_t modelId) {
             (lowerName.find("monument") != std::string::npos) ||
             (lowerName.find("sculpture") != std::string::npos);
         gpuModel.collisionStatue = statueName;
+        // Sittable furniture: chairs/benches/stools cause players to get stuck against
+        // invisible bounding boxes; WMOs already handle room collision.
+        bool sittableFurnitureName =
+            (lowerName.find("chair") != std::string::npos) ||
+            (lowerName.find("bench") != std::string::npos) ||
+            (lowerName.find("stool") != std::string::npos) ||
+            (lowerName.find("seat") != std::string::npos) ||
+            (lowerName.find("throne") != std::string::npos);
         bool smallSolidPropName =
-            statueName ||
+            (statueName && !sittableFurnitureName) ||
             (lowerName.find("crate") != std::string::npos) ||
             (lowerName.find("box") != std::string::npos) ||
             (lowerName.find("chest") != std::string::npos) ||
@@ -1023,6 +1031,10 @@ bool M2Renderer::loadModel(const pipeline::M2Model& model, uint32_t modelId) {
             (lowerName.find("bamboo") != std::string::npos) ||
             (lowerName.find("banana") != std::string::npos) ||
             (lowerName.find("coconut") != std::string::npos) ||
+            (lowerName.find("watermelon") != std::string::npos) ||
+            (lowerName.find("melon") != std::string::npos) ||
+            (lowerName.find("squash") != std::string::npos) ||
+            (lowerName.find("gourd") != std::string::npos) ||
             (lowerName.find("canopy") != std::string::npos) ||
             (lowerName.find("hedge") != std::string::npos) ||
             (lowerName.find("cactus") != std::string::npos) ||