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>

server/src/engine/mock.ts

@@ -380,7 +380,7 @@ export async function runMockFight(botAId: string, botBId: string): Promise<stri
       botAHp: hpA,
       botBHp: hpB,
       totalRounds: round,
-    }).where(eq(schema.fights.id, fightId))
+    }).where(eq(schema.fights.id, fightId)).run()
 
     if (hpA <= 0 || hpB <= 0) {
       winnerId = hpA <= 0 ? botB.id : botA.id
@@ -398,7 +398,7 @@ export async function runMockFight(botAId: string, botBId: string): Promise<stri
       status: 'finished',
       winnerId,
       endedAt: new Date().toISOString(),
-    }).where(eq(schema.fights.id, fightId))
+    }).where(eq(schema.fights.id, fightId)).run()
 
     if (winnerId) {
       const loserId = winnerId === botA.id ? botB.id : botA.id
@@ -415,7 +415,7 @@ export async function runMockFight(botAId: string, botBId: string): Promise<stri
         bestStreak: sql`MAX(${schema.bots.bestStreak}, ${newWinStreak})`,
         tier: calculateTier(newWinnerElo, winner.wins + 1),
         lastFightAt: new Date().toISOString(),
-      }).where(eq(schema.bots.id, winnerId))
+      }).where(eq(schema.bots.id, winnerId)).run()
 
       db.update(schema.bots).set({
         losses: sql`${schema.bots.losses} + 1`,
@@ -423,7 +423,7 @@ export async function runMockFight(botAId: string, botBId: string): Promise<stri
         winStreak: 0,
         tier: calculateTier(newLoserElo, loser.wins),
         lastFightAt: new Date().toISOString(),
-      }).where(eq(schema.bots.id, loserId))
+      }).where(eq(schema.bots.id, loserId)).run()
     }
   })