Fix Metro bundler refresh issue by preventing unnecessary file writes

- Only write auto-generated.d.ts when actual content changes
- Strip timestamp lines when comparing content to detect real changes
- Prevents Metro from refreshing when type content is unchanged
- Fixes flickering "Refreshing..." issue across all connected devices

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

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

lib/metro-ior-resolver.js

@@ -253,13 +253,13 @@ async function updateGlobalTypes() {
   const projectRoot = process.cwd();
   const typesDir = path.join(projectRoot, 'src', 'types');
   const globalTypesPath = path.join(typesDir, 'auto-generated.d.ts');
-  
+
   let content = '/**\n';
   content += ' * Auto-generated type declarations for remote IOR components\n';
   content += ` * Generated at: ${new Date().toISOString()}\n`;
   content += ' * DO NOT EDIT - This file is automatically maintained by metro-ior-resolver\n';
   content += ' */\n\n';
-  
+
   // Add all cached type definitions
   for (const [ior, entry] of typeCache.entries()) {
     content += `// Source: ${entry.source || 'unknown'}`;
@@ -272,16 +272,31 @@ async function updateGlobalTypes() {
     content += entry.content;
     content += '\n\n';
   }
-  
+
   // Ensure directory exists
   if (!fs.existsSync(typesDir)) {
     fs.mkdirSync(typesDir, { recursive: true });
   }
-  
-  // Write the file
-  fs.writeFileSync(globalTypesPath, content, 'utf-8');
-  
-  console.log(`[IOR Resolver] Updated auto-generated types: ${globalTypesPath}`);
+
+  // Only write if content has changed (compare without timestamp)
+  let shouldWrite = true;
+  if (fs.existsSync(globalTypesPath)) {
+    const existingContent = fs.readFileSync(globalTypesPath, 'utf-8');
+
+    // Remove timestamp lines for comparison
+    const stripTimestamp = (str) => str.replace(/ \* Generated at: .*\n/g, '').replace(/\/\/ Cached: .*\n/g, '');
+
+    if (stripTimestamp(existingContent) === stripTimestamp(content)) {
+      shouldWrite = false;
+      console.log(`[IOR Resolver] Type declarations unchanged, skipping write to prevent Metro refresh`);
+    }
+  }
+
+  if (shouldWrite) {
+    // Write the file
+    fs.writeFileSync(globalTypesPath, content, 'utf-8');
+    console.log(`[IOR Resolver] Updated auto-generated types: ${globalTypesPath}`);
+  }
 }
 
 /**