feat : add collaborators multi-select to TaskModal

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/components/task/TaskModal.vue

@@ -170,6 +170,30 @@
                             </div>
                         </div>
 
+                        <!-- Collaborators -->
+                        <div v-if="collaboratorOptions.length" class="mt-5">
+                            <p class="mb-2 text-sm font-medium text-neutral-700">Collaborateurs</p>
+                            <div class="flex flex-wrap gap-2">
+                                <label
+                                    v-for="user in collaboratorOptions"
+                                    :key="user.value"
+                                    class="cursor-pointer rounded-full px-3 py-1 text-xs font-semibold transition-all"
+                                    :class="form.collaboratorIds.includes(user.value)
+                                        ? 'bg-primary-500 text-white shadow-sm'
+                                        : 'bg-neutral-100 text-neutral-600 hover:bg-neutral-200'"
+                                >
+                                    <input
+                                        type="checkbox"
+                                        class="hidden"
+                                        :value="user.value"
+                                        :checked="form.collaboratorIds.includes(user.value)"
+                                        @change="toggleCollaborator(user.value)"
+                                    />
+                                    {{ user.label }}
+                                </label>
+                            </div>
+                        </div>
+
                         <!-- Description -->
                         <div class="mt-5">
                             <MalioInputTextArea
@@ -544,6 +568,7 @@ const form = reactive({
     effortId: null as number | null,
     priorityId: null as number | null,
     assigneeId: null as number | null,
+    collaboratorIds: [] as number[],
     groupId: null as number | null,
     tagIds: [] as number[],
     clientTicketId: null as number | null,
@@ -586,6 +611,18 @@ const userOptions = computed(() =>
     props.users.map(u => ({ label: u.username, value: u.id }))
 )
 
+const collaboratorOptions = computed(() =>
+    props.users
+        .filter(u => u.id !== form.assigneeId)
+        .map(u => ({ label: u.username, value: u.id }))
+)
+
+watch(() => form.assigneeId, (newAssigneeId) => {
+    if (newAssigneeId) {
+        form.collaboratorIds = form.collaboratorIds.filter(id => id !== newAssigneeId)
+    }
+})
+
 const groupOptions = computed(() => {
     let filtered = props.groups.filter(g => !g.archived)
     if (showProjectSelect.value && form.projectId) {
@@ -624,6 +661,12 @@ function toggleTag(id: number) {
     }
 }
 
+function toggleCollaborator(userId: number) {
+    const idx = form.collaboratorIds.indexOf(userId)
+    if (idx >= 0) form.collaboratorIds.splice(idx, 1)
+    else form.collaboratorIds.push(userId)
+}
+
 const weekDays = computed(() => [
     { value: 'monday', label: t('tasks.planning.days.mon') },
     { value: 'tuesday', label: t('tasks.planning.days.tue') },
@@ -648,6 +691,7 @@ function populateForm(task: Task | null) {
         form.effortId = task.effort?.id ?? null
         form.priorityId = task.priority?.id ?? null
         form.assigneeId = task.assignee?.id ?? null
+        form.collaboratorIds = task.collaborators?.map(c => c.id) ?? []
         form.groupId = task.group?.id ?? null
         form.tagIds = task.tags.map(t => t.id)
         form.clientTicketId = task.clientTicket?.id ?? null
@@ -694,6 +738,7 @@ function populateForm(task: Task | null) {
         form.effortId = null
         form.priorityId = null
         form.assigneeId = null
+        form.collaboratorIds = []
         form.groupId = null
         form.tagIds = []
         form.clientTicketId = null
@@ -906,6 +951,7 @@ async function handleSubmit() {
             effort: form.effortId ? `/api/task_efforts/${form.effortId}` : null,
             priority: form.priorityId ? `/api/task_priorities/${form.priorityId}` : null,
             assignee: form.assigneeId ? `/api/users/${form.assigneeId}` : null,
+            collaborators: form.collaboratorIds.map(id => `/api/users/${id}`),
             group: form.groupId ? `/api/task_groups/${form.groupId}` : null,
             project: `/api/projects/${resolvedProjectId.value}`,
             tags: form.tagIds.map(id => `/api/task_tags/${id}`),