fix: Drizzle transaction execution, canvas re-init, crowd removal

- Add .run() to all Drizzle queries inside sqlite.transaction() in
  orchestrator.ts and mock.ts — queries were building but never executing,
  leaving fights stuck as 'live' forever
- Remove spectator crowd from drawArenaDecor()
- Rename duplicate spawnProp to spawnWeaponProp (was crashing module load)
- Replace canvas element on re-init to avoid "KAPLAY already initialized"
- Add safeText() to strip brackets from k.text() calls (Kaplay treats
  [ ] as style markup, crashes on unclosed tags)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/FightViewer.vue

@@ -90,13 +90,19 @@ onUnmounted(() => {
 
 async function initScene() {
   if (!canvasRef.value || !props.fight.botA || !props.fight.botB) return
-  // Destroy previous scene to avoid "KAPLAY already initialized" warning
+  // Destroy previous scene fully — replace canvas to avoid "KAPLAY already initialized"
   if (scene) { scene.destroy(); scene = null }
 
   const container = canvasRef.value.parentElement
   if (container) {
-    canvasRef.value.width = container.clientWidth
-    canvasRef.value.height = container.clientHeight
+    // Replace canvas element so Kaplay gets a fresh context
+    const oldCanvas = canvasRef.value
+    const newCanvas = document.createElement('canvas')
+    newCanvas.className = oldCanvas.className
+    newCanvas.width = container.clientWidth
+    newCanvas.height = container.clientHeight
+    oldCanvas.replaceWith(newCanvas)
+    canvasRef.value = newCanvas
   }
 
   scene = await createFightScene({