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/pipeline/asset_manager.cpp

@@ -92,7 +92,7 @@ void AssetManager::setupFileCacheBudget() {
     const size_t envMaxMB = parseEnvSizeMB("WOWEE_FILE_CACHE_MAX_MB");
 
     const size_t minBudgetBytes = 256ull * 1024ull * 1024ull;
-    const size_t defaultMaxBudgetBytes = 32768ull * 1024ull * 1024ull;
+    const size_t defaultMaxBudgetBytes = 12288ull * 1024ull * 1024ull;  // 12 GB max for file cache
     const size_t maxBudgetBytes = (envMaxMB > 0)
         ? (envMaxMB * 1024ull * 1024ull)
         : defaultMaxBudgetBytes;