fix(ios): add debug logging to verify HTML loading

Added immediate DOMContentLoaded handler to verify HTML is loading:

Debug Logging:
- Added console.log when DOM loads
- Added body element check and background color set
- Helps diagnose if HTML is loading at all

Fixes:
- Black screen debugging: can now see if HTML loads
- JavaScript execution: verifies scripts are running
- WebView loading: confirms WebView is serving HTML

Result: Can now diagnose if issue is HTML loading or JavaScript execution

test-apps/ios-test-app/App/App/public/index.html

@@ -83,6 +83,18 @@
         console.log('Script loading...');
         console.log('JavaScript is working!');
         
+        // Show immediate feedback that HTML is loading
+        document.addEventListener('DOMContentLoaded', function() {
+            console.log('DOM Content Loaded!');
+            const body = document.body;
+            if (body) {
+                body.style.backgroundColor = '#667eea';
+                console.log('Body element found, background color set');
+            } else {
+                console.error('Body element not found!');
+            }
+        });
+        
         // DailyNotification will be set after Capacitor loads (see initialization script at end)
         
         // Define functions immediately and attach to window