Solo: no idle unready, no party corner in fullscreen; a cancelled Invite returns to solo

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

apps/desktop/lib/src/screens/home/connect_flow.dart

@@ -97,6 +97,7 @@ class ConnectFlow extends ChangeNotifier {
       _notify();
       return;
     }
+    final fromSolo = mode == ConnectMode.host && _session.solo.value;
     try {
       if (mode == ConnectMode.host) {
         await _session.host(params, form);
@@ -111,10 +112,14 @@ class ConnectFlow extends ChangeNotifier {
       return;
     }
     if (myAttempt != _attempt) {
-      // Cancelled after it got through: back out.
+      // Cancelled after it got through: back out (an Invite: back to solo).
       try {
+        if (fromSolo) {
+          await _session.cancelInvite();
+        } else {
           await _session.leave();
           await _session.stopServer();
+        }
       } catch (_) {}
       return;
     }

apps/desktop/lib/src/session/session_coordinator.dart

@@ -240,6 +240,9 @@ class SessionCoordinator {
   StreamSubscription? _statusSub;
 
   bool _manualClose = false;
+  /// A solo session (set by SessionState): no idle unready / sit out,
+  /// there is nobody to hold up.
+  bool solo = false;
   bool _playerReady = false;
   bool _wasPlayAllowed = false;
   // Last ready flag the server reported for self; restored after a
@@ -949,7 +952,9 @@ class SessionCoordinator {
     // activity so a pause after a long watch starts a fresh idle clock.
     if (r != null) _readyAfterJoinBack(r, now);
     final sitOutWhenIdle = AppSettings.instance.idleSitsOut.peek();
-    final event = _idle.tick(now,
+    final event = solo
+        ? IdleEvent.none
+        : _idle.tick(now,
             playing: serverState.peek()?.transport == 'playing',
             selfReady: selfMember.peek()?.ready ?? false);
     switch (event) {

apps/desktop/lib/src/shell/session_player.dart

@@ -296,7 +296,7 @@ class _SessionPlayerState extends State<SessionPlayer> {
                 _status(),
                 _progressLine(),
                 _jellyfinOverlay(),
-                if (widget.fullscreen) ...[_pausedParty(), _unreadChip()],
+                if (widget.fullscreen) ...[if (!SessionState.instance.solo.value) _pausedParty(), _unreadChip()],
               ] else
                 _miniOverlay(),
               // Sitting out: nothing is loaded; the card covers the

apps/desktop/lib/src/state/session_state.dart

@@ -260,12 +260,13 @@ class SessionState {
   /// pick, seeked to where it was; if hosting fails, solo comes back.
   Future<void> host(ConnectParams params, ConnectForm form) async {
     if (!solo.peek()) return _host(params, form: form);
-    final carry = _carry();
+    final carry = _invited = _carry();
     switching.value = true;
     try {
       await coordinator.leave();
       await stopServer();
       solo.value = false;
+      coordinator.solo = false;
       try {
         await _host(params, form: form);
       } catch (_) {
@@ -289,6 +290,27 @@ class SessionState {
     }
   }
 
+  /// What an Invite from solo carried over, for [cancelInvite].
+  ({PickedMedia pick, double position})? _invited;
+
+  /// Invite cancelled after the hosted server already came up: back to
+  /// solo with the same media, not out of the session.
+  Future<void> cancelInvite() async {
+    final carry = _invited;
+    switching.value = true;
+    try {
+      await coordinator.leave();
+      await stopServer();
+      await _host(_soloParams!, soloSession: true);
+      if (carry != null) await _resume(carry);
+    } catch (e) {
+      debugPrint('back to solo failed: $e');
+      await leave();
+    } finally {
+      switching.value = false;
+    }
+  }
+
   /// Watch alone: the same hosted path, on 127.0.0.1 and a free port, no
   /// password, nothing put up yet. Nobody else can reach it.
   Future<void> startSolo(ConnectParams params) async {
@@ -394,6 +416,7 @@ class SessionState {
         rethrow;
       }
       solo.value = soloSession;
+      coordinator.solo = soloSession;
       route.value = AppRoute.session;
     } finally {
       if (form != null) await _saveFormQuietly();
@@ -478,6 +501,7 @@ class SessionState {
     await coordinator.leave();
     await stopServer();
     solo.value = false;
+    coordinator.solo = false;
     serverLabel.value = '';
     status.value = const HealthStatus(HealthSeverity.info, 'idle');
     route.value = AppRoute.home;