Add heir management functionality in Falukant module

- Implemented setHeir method in FalukantService to designate a child as heir, including validation checks for user and child relationships.
- Updated FalukantController to expose the setHeir endpoint, allowing users to set heirs via the API.
- Enhanced FalukantRouter with a new route for setting heirs.
- Modified FamilyView component to include UI elements for setting heirs, with success and error feedback.
- Updated localization files in both German and English to include new translations related to heir management, improving user experience.

frontend/src/i18n/locales/de/falukant.json

@@ -405,6 +405,11 @@
                 "title": "Kinder",
                 "name": "Name",
                 "age": "Alter",
+                "heir": "Erbe",
+                "isHeir": "Erbe",
+                "setAsHeir": "Als Erben festlegen",
+                "heirSetSuccess": "Das Kind wurde erfolgreich als Erbe festgelegt.",
+                "heirSetError": "Fehler beim Festlegen des Erben.",
                 "actions": "Aktionen",
                 "none": "Keine Kinder vorhanden.",
                 "detailButton": "Details anzeigen",

frontend/src/i18n/locales/en/falukant.json

@@ -201,6 +201,23 @@
                 "councillor": "Councillor",
                 "assessor": "Assessor"
             }
+        },
+        "family": {
+            "children": {
+                "title": "Children",
+                "name": "Name",
+                "age": "Age",
+                "heir": "Heir",
+                "isHeir": "Heir",
+                "setAsHeir": "Set as Heir",
+                "heirSetSuccess": "The child has been successfully set as heir.",
+                "heirSetError": "Error setting heir.",
+                "actions": "Actions",
+                "none": "No children available.",
+                "detailButton": "Show Details",
+                "addChild": "Add Child",
+                "baptism": "Baptize"
+            }
         }
     }
 }

frontend/src/views/falukant/FamilyView.vue

@@ -117,6 +117,7 @@
                             <tr>
                                 <th>{{ $t('falukant.family.children.name') }}</th>
                                 <th>{{ $t('falukant.family.children.age') }}</th>
+                                <th>{{ $t('falukant.family.children.heir') }}</th>
                                 <th>{{ $t('falukant.family.children.actions') }}</th>
                             </tr>
                         </thead>
@@ -130,6 +131,12 @@
                                         }}</button>
                                 </td>
                                 <td>{{ child.age }}</td>
+                                <td>
+                                    <span v-if="child.isHeir" class="heir-badge">{{ $t('falukant.family.children.isHeir') }}</span>
+                                    <button v-else-if="child.hasName" @click="setAsHeir(child)" class="set-heir-button">
+                                        {{ $t('falukant.family.children.setAsHeir') }}
+                                    </button>
+                                </td>
                                 <td>
                                     <button @click="showChildDetails(child)">
                                         {{ $t('falukant.family.children.detailButton') }}
@@ -241,6 +248,23 @@ export default {
             console.log('Show details for child:', child);
         },
 
+        async setAsHeir(child) {
+            if (!child.childCharacterId) {
+                console.error('Child character ID missing');
+                return;
+            }
+            try {
+                await apiClient.post('/api/falukant/family/set-heir', {
+                    childCharacterId: child.childCharacterId
+                });
+                await this.loadFamilyData();
+                this.$root.$refs.messageDialog?.open('tr:falukant.family.children.heirSetSuccess');
+            } catch (error) {
+                console.error('Error setting heir:', error);
+                this.$root.$refs.errorDialog?.open('tr:falukant.family.children.heirSetError');
+            }
+        },
+
         formatCost(value) {
             return new Intl.NumberFormat(navigator.language, { minimumFractionDigits: 2, maximumFractionDigits: 2 }).format(value);
         },
@@ -457,4 +481,28 @@ h2 {
     height: 100%;
     transition: width 0.3s ease, background-color 0.3s ease;
 }
+
+.heir-badge {
+    display: inline-block;
+    padding: 4px 8px;
+    background-color: #4CAF50;
+    color: white;
+    border-radius: 4px;
+    font-size: 0.9em;
+    font-weight: bold;
+}
+
+.set-heir-button {
+    padding: 4px 8px;
+    background-color: #2196F3;
+    color: white;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 0.9em;
+}
+
+.set-heir-button:hover {
+    background-color: #1976D2;
+}
 </style>