docs: add comprehensive documentation for automatic capacitor.build.gradle fix

- Add detailed inline documentation in build-native.sh explaining the problem, why it happens, and the solution
- Update fix-capacitor-build.sh with comprehensive header documentation
- Include clear explanations of when the fix gets overwritten and how to restore it
- Add user-friendly output with emojis and clear messaging
- Document the automatic fix process with step-by-step explanations

This provides complete transparency about what the scripts do and why,
making it easy for developers to understand and maintain the fix.

scripts/build-native.sh

@@ -82,12 +82,54 @@ build_android() {
         log_warn "This appears to be a plugin development project"
         log_warn "Android test app not properly initialized"
         
-        # Fix capacitor.build.gradle if needed
+        # =============================================================================
+        # AUTOMATIC FIX: capacitor.build.gradle for Plugin Development Projects
+        # =============================================================================
+        # 
+        # PROBLEM: The capacitor.build.gradle file is auto-generated by Capacitor CLI
+        # and includes a line that tries to load a file that doesn't exist in plugin
+        # development projects:
+        #   apply from: "../capacitor-cordova-android-plugins/cordova.variables.gradle"
+        #
+        # WHY THIS HAPPENS: 
+        # - This file is generated by 'npx cap sync', 'npx cap update', etc.
+        # - It assumes a full Capacitor app with proper plugin integration
+        # - Plugin development projects don't have the full Capacitor setup
+        #
+        # THE FIX:
+        # - Comment out the problematic line to prevent build failures
+        # - Add explanatory comment about why it's commented out
+        # - This fix gets applied automatically every time the build script runs
+        #
+        # WHEN THIS FIX GETS OVERWRITTEN:
+        # - Running 'npx cap sync' will regenerate the file and remove our fix
+        # - Running 'npx cap update' will regenerate the file and remove our fix
+        # - Running 'npx cap add android' will regenerate the file and remove our fix
+        #
+        # HOW TO RESTORE THE FIX:
+        # - Run this build script again (it will reapply the fix automatically)
+        # - Or run: ./scripts/fix-capacitor-build.sh
+        # - Or manually comment out the problematic line
+        #
+        # =============================================================================
+        
         if [ -f "app/capacitor.build.gradle" ]; then
             if grep -q "^apply from: \"../capacitor-cordova-android-plugins/cordova.variables.gradle\"" "app/capacitor.build.gradle"; then
-                log_info "Fixing capacitor.build.gradle for plugin development project..."
+                log_info "🔧 Applying automatic fix to capacitor.build.gradle..."
+                log_info "   Reason: Plugin development project missing Capacitor integration files"
+                log_info "   Fix: Commenting out problematic 'apply from' line"
+                
+                # Apply the fix by commenting out the problematic line
                 sed -i 's/^apply from: "\.\.\/capacitor-cordova-android-plugins\/cordova\.variables\.gradle"/\/\/ Plugin development project - no Capacitor integration files needed\n\/\/ &/' "app/capacitor.build.gradle"
+                
+                log_info "✅ Fix applied successfully"
+                log_warn "⚠️  Note: This fix will be lost if you run 'npx cap sync' or 'npx cap update'"
+                log_info "💡 To restore the fix later, run this build script again or use: ./scripts/fix-capacitor-build.sh"
+            else
+                log_info "ℹ️  capacitor.build.gradle already has the fix applied"
             fi
+        else
+            log_warn "⚠️  capacitor.build.gradle not found - this may indicate a different project structure"
         fi
         
         log_warn "Plugin source code has been built successfully"