implemented custom subject colors for the timetable and unified the color palette system

lib/api/marianumconnect/queries/timetable_get_subjects/timetable_get_subjects_response.dart

@@ -10,10 +10,15 @@ class McSubject {
   final String shortName;
   final String longName;
 
+  /// Persönliche Fach-Farbe (Palette-Name aus [SubjectColor]), serverseitig pro
+  /// Nutzer gepflegt. `null`, wenn für dieses Fach keine Farbe gesetzt ist.
+  final String? color;
+
   McSubject({
     required this.id,
     required this.shortName,
     required this.longName,
+    this.color,
   });
 
   factory McSubject.fromJson(Map<String, dynamic> json) =>

lib/api/marianumconnect/queries/timetable_get_subjects/timetable_get_subjects_response.g.dart

@@ -10,12 +10,14 @@ McSubject _$McSubjectFromJson(Map<String, dynamic> json) => McSubject(
   id: (json['id'] as num).toInt(),
   shortName: json['shortName'] as String,
   longName: json['longName'] as String,
+  color: json['color'] as String?,
 );
 
 Map<String, dynamic> _$McSubjectToJson(McSubject instance) => <String, dynamic>{
   'id': instance.id,
   'shortName': instance.shortName,
   'longName': instance.longName,
+  'color': instance.color,
 };
 
 TimetableGetSubjectsResponse _$TimetableGetSubjectsResponseFromJson(

lib/api/marianumconnect/queries/timetable_subject_colors/timetable_subject_color_remove.dart

@@ -0,0 +1,25 @@
+import 'package:dio/dio.dart';
+
+import '../../errors/marianumconnect_error.dart';
+import '../../marianumconnect_api.dart';
+import '../../marianumconnect_endpoint.dart';
+
+/// Entfernt die persönliche Farbe eines Fachs (Fach fällt auf die Status-Farbe
+/// zurück). Schlüssel ist das Fach-Kürzel (`shortName`).
+class TimetableSubjectColorRemove {
+  final Dio _dio;
+
+  TimetableSubjectColorRemove({Dio? dio})
+    : _dio = dio ?? MarianumConnectApi.dio();
+
+  Future<void> run(String subjectShort) async {
+    try {
+      await _dio.delete<void>(
+        MarianumConnectEndpoint.resolve('timetable/subject-colors'),
+        queryParameters: {'subject': subjectShort},
+      );
+    } on DioException catch (e) {
+      throw mapMarianumConnectError(e);
+    }
+  }
+}

lib/api/marianumconnect/queries/timetable_subject_colors/timetable_subject_color_set.dart

@@ -0,0 +1,24 @@
+import 'package:dio/dio.dart';
+
+import '../../errors/marianumconnect_error.dart';
+import '../../marianumconnect_api.dart';
+import '../../marianumconnect_endpoint.dart';
+
+/// Setzt (oder überschreibt) die persönliche Farbe eines Fachs. Der Schlüssel
+/// ist das Fach-Kürzel (`shortName`); die Farbe ist ein Palette-Name.
+class TimetableSubjectColorSet {
+  final Dio _dio;
+
+  TimetableSubjectColorSet({Dio? dio}) : _dio = dio ?? MarianumConnectApi.dio();
+
+  Future<void> run(String subjectShort, String color) async {
+    try {
+      await _dio.put<void>(
+        MarianumConnectEndpoint.resolve('timetable/subject-colors'),
+        data: {'subject': subjectShort, 'color': color},
+      );
+    } on DioException catch (e) {
+      throw mapMarianumConnectError(e);
+    }
+  }
+}