fix(know-your-world): raise auto-zoom thresholds for tiny regions

Increase the max acceptance thresholds so sub-pixel regions like Gibraltar,
Vatican City, and Monaco get maximum zoom instead of being rejected:

- Sub-pixel (<1px): 2-8% → 2-40% (allows 1000x zoom)
- Tiny (1-5px): 5-15% → 5-25%
- Normal small: 10-25% → 10-30%

Previously, at 1000x zoom a 0.08px region would occupy ~20% of the magnifier,
exceeding the 8% max threshold. The algorithm would then step DOWN trying to
find a zoom where it fits within 2-8%, making tiny regions harder to select.

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

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

apps/web/src/arcade-games/know-your-world/utils/adaptiveZoomSearch.ts

@@ -101,15 +101,18 @@ export function calculateAdaptiveThresholds(smallestSize: number): {
   max: number
 } {
   if (smallestSize < 1) {
-    // Sub-pixel regions: accept 2-8% of magnifier
-    return { min: 0.02, max: 0.08 }
+    // Sub-pixel regions (Gibraltar at 0.08px, Vatican, Monaco):
+    // These are so small that we want maximum zoom. Accept anything from 2% up to 40%.
+    // At 1000x zoom, a 0.08px region becomes 80px in a ~400px magnifier = 20%.
+    // We want to accept this rather than stepping down to lower zoom.
+    return { min: 0.02, max: 0.4 }
   }
   if (smallestSize < 5) {
-    // Tiny regions (1-5px): accept 5-15% of magnifier
-    return { min: 0.05, max: 0.15 }
+    // Tiny regions (1-5px): accept 5-25% of magnifier
+    return { min: 0.05, max: 0.25 }
   }
-  // Normal small regions: accept 10-25% of magnifier
-  return { min: 0.1, max: 0.25 }
+  // Normal small regions: accept 10-30% of magnifier
+  return { min: 0.1, max: 0.3 }
 }
 
 /**