fix(know-your-world): remove confidence gate from hot/cold visual emoji

The confidence threshold was gating both audio AND visual feedback,
causing noticeable lag in the emoji updates under the cursor. Now:
- Visual emoji updates immediately on every sample (100ms)
- Confidence threshold only gates audio speech

This makes the hot/cold feedback feel much more responsive.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/web/src/arcade-games/know-your-world/hooks/useHotColdFeedback.ts

@@ -442,8 +442,8 @@ export function useHotColdFeedback({
       // This runs on every sample for responsive emoji updates
       const visualFeedbackType = determineFeedbackType(state, zone, currentDistance, false)
 
-      // Visual: Update emoji immediately (no cooldown gates)
-      if (visualFeedbackType && confidence >= CONFIDENCE_THRESHOLD) {
+      // Visual: Update emoji immediately (no gates - confidence only affects audio)
+      if (visualFeedbackType) {
         setLastFeedbackType(visualFeedbackType)
       }