UI: Add ChannelTile with logos, search/filter, and design improvements

test/widget_test.dart

@@ -18,6 +18,7 @@ void main() {
 
     // Verify HomeScreen has main controls (M3U URL input)
     expect(find.text('M3U URL'), findsOneWidget);
-    expect(find.byType(TextField), findsOneWidget);
+    // We now have a search box + M3U input; ensure at least one TextField exists
+    expect(find.byType(TextField), findsWidgets);
   });
 }