Initial commit: watch-together phases 0-4 + presence hardening, internet-tested

apps/desktop/test/media_input_test.dart

@@ -0,0 +1,33 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:watch_together/src/widgets/media_input.dart';
+
+void main() {
+  test('http url routes to linkUrl', () {
+    expect(parseMediaInput('http://example.com/v.mp4'),
+        (mediaPath: '', linkUrl: 'http://example.com/v.mp4'));
+  });
+
+  test('https url routes to linkUrl', () {
+    expect(parseMediaInput('https://example.com/v.mp4'),
+        (mediaPath: '', linkUrl: 'https://example.com/v.mp4'));
+  });
+
+  test('scheme match is case-insensitive and trimmed', () {
+    expect(parseMediaInput('  HTTPS://example.com/v.mp4  '),
+        (mediaPath: '', linkUrl: 'HTTPS://example.com/v.mp4'));
+  });
+
+  test('file path routes to mediaPath', () {
+    expect(parseMediaInput('/home/u/Videos/chiyo.mp4'),
+        (mediaPath: '/home/u/Videos/chiyo.mp4', linkUrl: ''));
+  });
+
+  test('empty input stays empty', () {
+    expect(parseMediaInput('   '), (mediaPath: '', linkUrl: ''));
+  });
+
+  test('non-http scheme stays a path', () {
+    expect(parseMediaInput('ftp://example.com/v.mp4'),
+        (mediaPath: 'ftp://example.com/v.mp4', linkUrl: ''));
+  });
+}