wip: Sicherungs-Commit aller Änderungen seit April + Arbeitsstruktur (CLAUDE.md, ROADMAP.md, PROGRESS.md, Autopilot)

6 Wochen uncommittete Arbeit (Voice-Channels, LiveKit-Manager, Settings-Modal u.v.m.)
als ein WIP-Commit gesichert, damit nichts verloren geht und der Pi den aktuellen
Stand klonen kann. Thematische Aufarbeitung: siehe ROADMAP M0.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CPrAGBxBT6GfPXzeWQ4AXb

lib/features/chat/reaction_service.dart

@@ -0,0 +1,38 @@
+import 'package:shared_preferences/shared_preferences.dart';
+
+class ReactionService {
+  static const _key = 'recent_reactions';
+  static const _maxRecent = 6;
+
+  static final _defaultReactions = ['👍', '❤️', '😂', '😮', '😢', '🙏'];
+
+  static List<String> _recent = [];
+  static bool _loaded = false;
+
+  static Future<void> load() async {
+    if (_loaded) return;
+    final prefs = await SharedPreferences.getInstance();
+    _recent = prefs.getStringList(_key) ?? [];
+    _loaded = true;
+  }
+
+  static List<String> get quickReactions {
+    if (_recent.isEmpty) return _defaultReactions;
+    // Fill up to 6 with defaults not already in recent
+    final result = List<String>.from(_recent);
+    for (final d in _defaultReactions) {
+      if (result.length >= _maxRecent) break;
+      if (!result.contains(d)) result.add(d);
+    }
+    return result.take(_maxRecent).toList();
+  }
+
+  static Future<void> recordUsed(String emoji) async {
+    await load();
+    _recent.remove(emoji);
+    _recent.insert(0, emoji);
+    if (_recent.length > _maxRecent) _recent = _recent.sublist(0, _maxRecent);
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setStringList(_key, _recent);
+  }
+}