fix(accidentForm): optimize participant filtering and update localAccident handling

- Improved availableMembers computed property to handle participant IDs more robustly, ensuring correct filtering of members.
- Enhanced watch on accident to prevent unnecessary updates to localAccident, avoiding potential infinite loops.
- Refined localAccident watchers to emit updates only on relevant changes to memberId and accident text, improving performance and reducing redundant emissions.

frontend/src/components/AccidentFormDialog.vue

@@ -86,7 +86,14 @@ export default {
   },
   computed: {
     availableMembers() {
-      return this.members.filter(m => this.participants.indexOf(m.id) >= 0);
+      // participants ist ein Array von IDs, nicht von Objekten
+      const participantIds = Array.isArray(this.participants) 
+        ? (this.participants.length > 0 && typeof this.participants[0] === 'object' 
+            ? this.participants.map(p => p.id || p)
+            : this.participants)
+        : [];
+      const participantSet = new Set(participantIds);
+      return this.members.filter(m => participantSet.has(m.id));
     },
     isValid() {
       return this.localAccident.memberId && this.localAccident.accident && this.localAccident.accident.trim() !== '';
@@ -95,15 +102,20 @@ export default {
   watch: {
     accident: {
       handler(newVal) {
-        this.localAccident = { ...newVal };
+        // Nur aktualisieren, wenn sich wirklich etwas geändert hat (verhindert Endlosschleife)
+        if (newVal && (newVal.memberId !== this.localAccident.memberId || newVal.accident !== this.localAccident.accident)) {
+          this.localAccident = { ...newVal };
+        }
       },
-      deep: true
+      immediate: true
     },
-    localAccident: {
-      handler(newVal) {
-        this.$emit('update:accident', newVal);
-      },
-      deep: true
+    'localAccident.memberId'() {
+      // Emit nur bei Änderung der memberId, nicht bei jeder tiefen Änderung
+      this.$emit('update:accident', { ...this.localAccident });
+    },
+    'localAccident.accident'() {
+      // Emit nur bei Änderung des accident-Textes
+      this.$emit('update:accident', { ...this.localAccident });
     }
   },
   methods: {