feat(ui) : add task list view with bulk actions, filters, and priority flag

- Add TaskListItem component with checkbox, project color, priority flag
- Add TaskBulkActions toolbar (bulk status/user/priority/effort/group update, delete)
- Add list view toggle button in my-tasks and project pages
- Add Priorité and Effort filters to project page
- TaskCard supports showProjectColor prop (color in my-tasks, neutral in project)

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

frontend/components/task/TaskListItem.vue

@@ -0,0 +1,108 @@
+<template>
+    <div
+        class="flex cursor-pointer items-stretch gap-3 rounded-[10px] bg-white px-3 py-2.5 transition-colors hover:shadow-sm sm:px-4"
+        :class="selected ? 'ring-2 ring-primary-500' : ''"
+        @click="emit('click')"
+    >
+        <!-- Content -->
+        <div class="min-w-0 flex-1">
+            <!-- Row 1: checkbox + code + flag -->
+            <div class="flex items-center gap-1.5">
+                <div
+                    class="flex h-4 w-4 shrink-0 cursor-pointer items-center justify-center rounded border-2 transition-colors"
+                    :class="selected ? 'border-primary-500 bg-primary-500' : 'border-neutral-300 hover:border-primary-400'"
+                    @click.stop="emit('toggle-select', task.id)"
+                >
+                    <Icon v-if="selected" name="mdi:check" size="12" class="text-white" />
+                </div>
+                <span
+                    v-if="task.project && task.number"
+                    class="text-xs font-semibold"
+                    :class="showProjectColor ? '' : 'text-neutral-400'"
+                    :style="showProjectColor && task.project.color ? { color: task.project.color } : {}"
+                >
+                    {{ task.project.code }}-{{ task.number }}
+                </span>
+                <Icon
+                    v-if="task.priority?.label === 'Haute'"
+                    name="mdi:flag-variant"
+                    class="h-3.5 w-3.5 text-red-600"
+                />
+            </div>
+            <!-- Row 2: title -->
+            <h4 class="mt-1 text-sm font-semibold text-neutral-900">{{ task.title }}</h4>
+            <!-- Row 3: tags + status -->
+            <div class="mt-2 flex flex-wrap items-center gap-1.5">
+                <span
+                    v-for="tag in task.tags"
+                    :key="tag.id"
+                    class="rounded-full px-2 py-0.5 text-[10px] font-semibold text-white"
+                    :style="{ backgroundColor: tag.color }"
+                >
+                    {{ tag.label }}
+                </span>
+                <span
+                    v-if="task.status"
+                    class="text-xs font-semibold uppercase text-neutral-400"
+                >
+                    {{ task.status.label }}
+                </span>
+                <span v-else class="text-xs font-semibold uppercase text-neutral-300">
+                    Backlog
+                </span>
+            </div>
+        </div>
+
+        <!-- Right: timer top, avatar bottom -->
+        <div class="flex shrink-0 flex-col items-end justify-between self-stretch gap-1">
+            <button
+                class="shrink-0 transition-colors"
+                :class="isTimerOnTask ? 'text-[#F18619] hover:text-[#d97314]' : 'text-neutral-400 hover:text-primary-500'"
+                @click.stop="isTimerOnTask ? timerStore.stop() : timerStore.startFromTask(task)"
+            >
+                <Icon :name="isTimerOnTask ? 'mdi:stop-circle-outline' : 'mdi:play-circle-outline'" size="20" />
+            </button>
+            <UserAvatar
+                v-if="task.assignee"
+                :user="task.assignee"
+                size="xs"
+            />
+            <span
+                v-else
+                class="flex h-5 w-5 items-center justify-center rounded-full bg-neutral-200 text-neutral-400"
+            >
+                <Icon name="mdi:account-outline" size="14" />
+            </span>
+        </div>
+    </div>
+</template>
+
+<script setup lang="ts">
+import type { Task } from '~/services/dto/task'
+
+const props = withDefaults(defineProps<{
+    task: Task
+    showProjectColor?: boolean
+    selected?: boolean
+}>(), {
+    showProjectColor: false,
+    selected: false,
+})
+
+const emit = defineEmits<{
+    (e: 'click'): void
+    (e: 'toggle-select', taskId: number): void
+}>()
+
+const timerStore = useTimerStore()
+
+const isTimerOnTask = computed(() => {
+    const entry = timerStore.activeEntry
+    if (!entry?.task) return false
+    const entryTaskId = typeof entry.task === 'string'
+        ? entry.task
+        : (entry.task['@id'] ?? entry.task.id)
+    const taskId = props.task['@id'] ?? props.task.id
+    return entryTaskId === taskId || entryTaskId === `/api/tasks/${props.task.id}`
+})
+</script>