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/pages/my-tasks.vue

@@ -436,10 +436,16 @@ onMounted(() => {
                         />
                         <span
                             v-if="task.project && task.number"
-                            class="text-sm font-medium text-primary-500"
+                            class="text-sm font-semibold"
+                            :style="{ color: task.project.color }"
                         >
                             {{ task.project.code }}-{{ task.number }}
                         </span>
+                        <Icon
+                            v-if="task.priority?.label === 'Haute'"
+                            name="mdi:flag-variant"
+                            class="h-4 w-4 text-red-600"
+                        />
                     </div>
                 </div>
             </div>