feat(ui) : improve time-tracking UX, responsive tags, and task priority flag

- Add duplicate button in time entry drawer
- Make time entry blocks and list responsive (tags wrap, hide on narrow)
- Replace date filter input with calendar icon next to month title
- Fix scroll to current hour in calendar (use gridBodyEl)
- Show project color on ticket code in task cards and my-tasks
- Add red flag icon for high priority tasks in kanban and my-tasks

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

frontend/components/time-tracking/TimeEntryDrawer.vue

@@ -105,12 +105,22 @@
                 >
                     Supprimer
                 </button>
-                <button
-                    type="submit"
-                    class="rounded-md bg-primary-500 px-4 py-2 text-sm font-semibold text-white hover:bg-primary-600 transition"
-                >
-                    Enregistrer
-                </button>
+                <div class="flex gap-2">
+                    <button
+                        v-if="isEditing"
+                        type="button"
+                        class="rounded-md bg-blue-500 px-4 py-2 text-sm font-semibold text-white hover:bg-blue-600 transition"
+                        @click="onDuplicate"
+                    >
+                        Dupliquer
+                    </button>
+                    <button
+                        type="submit"
+                        class="rounded-md bg-primary-500 px-4 py-2 text-sm font-semibold text-white hover:bg-primary-600 transition"
+                    >
+                        Enregistrer
+                    </button>
+                </div>
             </div>
         </form>
     </AppDrawer>
@@ -231,6 +241,26 @@ watch([() => props.modelValue, () => props.entry] as const, ([open, entry]) => {
     }
 })
 
+async function onDuplicate() {
+    if (!form.date || !form.startTime || !form.endTime) return
+
+    const { create } = useTimeEntryService()
+
+    const payload: Record<string, unknown> = {
+        title: form.title || null,
+        description: form.description || null,
+        startedAt: toISO(form.date, form.startTime),
+        stoppedAt: form.endTime ? toISO(form.date, form.endTime) : null,
+        user: `/api/users/${form.userId}`,
+        project: form.projectId ? `/api/projects/${form.projectId}` : null,
+        tags: form.tagIds.map(id => `/api/task_tags/${id}`),
+    }
+
+    await create(payload as TimeEntryWrite)
+    emit('saved')
+    isOpen.value = false
+}
+
 async function onDelete() {
     if (!props.entry) return
     const { remove } = useTimeEntryService()