refactor(front): extract shared utils and rewire pages

app/components/common/RequirementListEditor.vue

@@ -66,7 +66,7 @@
                 type="text"
                 class="input input-bordered input-sm"
                 :placeholder="labels.labelPlaceholder"
-                @input="updateRequirement(index, { label: $event.target.value })"
+                @input="handleLabelInput(index, $event)"
               />
             </div>
 
@@ -79,7 +79,7 @@
                 type="number"
                 min="0"
                 class="input input-bordered input-sm"
-                @input="updateRequirement(index, { minCount: parseNumber($event.target.value) })"
+                @input="handleMinInput(index, $event)"
               />
             </div>
 
@@ -93,7 +93,7 @@
                 type="number"
                 min="0"
                 class="input input-bordered input-sm"
-                @input="updateRequirement(index, { maxCount: parseOptionalNumber($event.target.value) })"
+                @input="handleMaxInput(index, $event)"
               />
             </div>
           </div>
@@ -113,7 +113,7 @@
               type="checkbox"
               class="checkbox checkbox-sm"
               :checked="(requirement.required ?? requiredFallback) === true"
-              @change="updateRequirement(index, { required: $event.target.checked })"
+              @change="handleRequiredChange(index, $event)"
             />
             {{ labels.requiredLabel }}
           </label>
@@ -123,7 +123,7 @@
               type="checkbox"
               class="checkbox checkbox-sm"
               :checked="(requirement.allowNewModels ?? allowNewModelsFallback) === true"
-              @change="updateRequirement(index, { allowNewModels: $event.target.checked })"
+              @change="handleAllowNewModelsChange(index, $event)"
             />
             {{ labels.allowNewModelsLabel }}
           </label>
@@ -277,6 +277,37 @@ const parseOptionalNumber = (value: string) => {
   return Number.isFinite(parsed) ? parsed : null
 }
 
+// Type-safe event handlers
+const getInputValue = (event: Event): string => {
+  const target = event.target as HTMLInputElement | null
+  return target?.value ?? ''
+}
+
+const getCheckboxValue = (event: Event): boolean => {
+  const target = event.target as HTMLInputElement | null
+  return target?.checked ?? false
+}
+
+const handleLabelInput = (index: number, event: Event) => {
+  updateRequirement(index, { label: getInputValue(event) })
+}
+
+const handleMinInput = (index: number, event: Event) => {
+  updateRequirement(index, { minCount: parseNumber(getInputValue(event)) })
+}
+
+const handleMaxInput = (index: number, event: Event) => {
+  updateRequirement(index, { maxCount: parseOptionalNumber(getInputValue(event)) })
+}
+
+const handleRequiredChange = (index: number, event: Event) => {
+  updateRequirement(index, { required: getCheckboxValue(event) })
+}
+
+const handleAllowNewModelsChange = (index: number, event: Event) => {
+  updateRequirement(index, { allowNewModels: getCheckboxValue(event) })
+}
+
 const draggingRequirementIndex = ref<number | null>(null)
 const requirementDropTargetIndex = ref<number | null>(null)
 
@@ -297,6 +328,10 @@ const reorderRequirements = (from: number, to: number) => {
   }
   const updated = list.slice() as Requirement[]
   const [moved] = updated.splice(from, 1)
+  if (!moved) {
+    resetRequirementDragState()
+    return
+  }
   updated.splice(to, 0, moved)
   requirements.value = applyOrderIndex(updated)
   resetRequirementDragState()