Side-app use: copy/open links and titles everywhere, version on the Settings tab, known links preview instantly, Ctrl+V adds to Up next

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/lib/src/widgets/copy_open.dart

@@ -0,0 +1,66 @@
+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+
+import '../state/session_state.dart';
+
+// Reusing what the app shows elsewhere: copying a link or a title, opening
+// a page in the browser. One wording and one confirmation (a small toast)
+// for every menu that offers them.
+
+/// The labels of the reuse actions, the same in every menu.
+abstract final class ReuseText {
+  static const copyLink = 'Copy link';
+  static const copyTitle = 'Copy title';
+  static const copyMessage = 'Copy message';
+  static const openInBrowser = 'Open in browser';
+  static const openInJellyfin = 'Open in Jellyfin';
+}
+
+/// Tests: where the confirmation goes instead of the session's toasts.
+@visibleForTesting
+void Function(String text)? debugReuseToast;
+
+void _toast(String text) {
+  final debug = debugReuseToast;
+  if (debug != null) return debug(text);
+  SessionState.instance.coordinator.showToast(text);
+}
+
+/// Opens [url] in the default browser (no url_launcher dependency); false
+/// when no browser could be started.
+Future<bool> openInBrowser(String url) async {
+  try {
+    final ProcessResult r;
+    if (Platform.isWindows) {
+      r = await Process.run('rundll32', ['url.dll,FileProtocolHandler', url]);
+    } else if (Platform.isMacOS) {
+      r = await Process.run('open', [url]);
+    } else {
+      r = await Process.run('xdg-open', [url]);
+    }
+    return r.exitCode == 0;
+  } catch (_) {
+    return false;
+  }
+}
+
+/// Puts [text] on the clipboard and confirms it with a toast ([done]:
+/// its text, e.g. "Link copied").
+Future<void> copyToClipboard(String text, {String done = 'Copied'}) async {
+  try {
+    await Clipboard.setData(ClipboardData(text: text));
+  } catch (_) {
+    _toast("Couldn't copy");
+    return;
+  }
+  _toast(done);
+}
+
+/// Opens [url] in the browser; when none opens, copies it instead and
+/// says so.
+Future<void> openLink(String url) async {
+  if (await openInBrowser(url)) return;
+  await copyToClipboard(url, done: "Couldn't open a browser — link copied");
+}