Restructure step 0: test safety net, AppEvent/Notifier seam, platform ports, protocol 16 planned

- Tests: the four known failures fixed (test-side causes), one duplicate
  file and four detail-pinning cases removed, every test that pins
  behaviour the restructure changes tagged with its step.
- Every toast, sound and activity-log line goes through Notifier.notify
  (AppEvent), mapped one-to-one to today's behaviour.
- Platform ports (shell, URLs, folders, link resolver, system
  notifications) with desktop implementations; window_manager, Process
  and file_picker now live only in platform/desktop/.
- ROADMAP: protocol 16 planned; app id dev.foxyz.starsync.

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

apps/desktop/lib/src/queue/queue_controller.dart

@@ -13,6 +13,7 @@ import '../jellyfin/accounts.dart';
 import '../jellyfin/format.dart' show pickFor;
 import '../jellyfin/session_media.dart';
 import '../screens/home/picked_media.dart';
+import '../session/app_events.dart' show AddedToUpNext;
 import '../session/media_art.dart';
 import '../session/session_coordinator.dart';
 import '../state/settings.dart';
@@ -82,7 +83,6 @@ class QueueController {
     if (_attached) return;
     _attached = true;
     coord.sync.states.listen(_onState);
-    coord.sync.feeds.listen(_onFeed);
     effect(() {
       final next = coord.nextEpisode.value;
       final plan = coord.jellyfinPlan.value;
@@ -122,7 +122,7 @@ class QueueController {
     if (item.key.isNotEmpty) _local[item.key] = (pick: pick, at: DateTime.now());
     final thumb = built.thumb;
     coord.sync.sendQueue(QueueIntent.add(item, next: next, thumb: thumb == null ? '' : base64Encode(thumb)));
-    coord.showToast('Added ${item.title} to Up next');
+    coord.notify(AddedToUpNext(item.title));
     return null;
   }
 
@@ -369,12 +369,6 @@ class QueueController {
     _warm(r);
   }
 
-  void _onFeed(FeedMessage f) {
-    if (f.action == 'queue-skip') {
-      coord.showToast('Skipped ${f.target ?? 'an item'}${f.reason.isEmpty ? '' : ': ${f.reason}'}');
-    }
-  }
-
   /// Forgets what no longer matters: performing marks after a minute (a
   /// swap that never landed may be tried again), local picks no longer
   /// queued.

apps/desktop/lib/src/queue/queue_ui.dart

@@ -3,7 +3,6 @@ import 'dart:math' as math;
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:fox_utils/fox_utils.dart' show ClipboardX, DesktopDropX, DropTarget;
 import 'package:leaf_widgets/leaf_widgets.dart' show LeafPopover, LeafPopoverController;
 import 'package:signals/signals_flutter.dart';
 import 'package:sync_relay_core/core.dart';
@@ -640,23 +639,9 @@ class _QueuePanelState extends State<QueuePanel> {
     return KeyEventResult.ignored;
   }
 
-  Future<({List<String> files, String? text})> _readClipboard() async {
-    var files = const <String>[];
-    String? text;
-    try {
-      files = await ClipboardX.readFiles();
-    } catch (_) {}
-    if (files.isEmpty) {
-      try {
-        text = await ClipboardX.readText();
-      } catch (_) {}
-    }
-    return (files: files, text: text);
-  }
-
   /// Ctrl+V: the clipboard's video files, else the links in its text.
   Future<void> _paste() async {
-    final clip = await (widget.readClipboard ?? _readClipboard)();
+    final clip = await (widget.readClipboard ?? SessionState.instance.ports.shell.readPaste)();
     final picks = _picksFrom([...clip.files, ...?clip.text?.split(RegExp(r'\s+'))]);
     if (!mounted) return;
     if (picks.isEmpty) {
@@ -829,12 +814,12 @@ class _QueuePanelState extends State<QueuePanel> {
   @override
   Widget build(BuildContext context) {
     final height = MediaQuery.sizeOf(context).height;
-    final drop = DropTarget(
-      onDragEntered: (_) => setState(() => _dragging = true),
-      onDragExited: (_) => setState(() => _dragging = false),
-      onDragDone: (d) {
+    final drop = SessionState.instance.ports.shell.dropTarget(
+      onEnter: () => setState(() => _dragging = true),
+      onExit: () => setState(() => _dragging = false),
+      onDrop: (paths, _) {
         setState(() => _dragging = false);
-        _dropped(DesktopDropX.pathsOf(d.files));
+        _dropped(paths);
       },
       // Esc: the popover's own (it fades out).
       child: Builder(