feat(kanban) : show client ticket icon on task cards, my-tasks, and task modal

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/pages/my-tasks.vue

@@ -411,12 +411,20 @@ onMounted(() => {
                     >
                         <Icon :name="isTimerOnTask(task) ? 'mdi:stop-circle-outline' : 'mdi:play-circle-outline'" size="20" />
                     </button>
-                    <span
-                        v-if="task.project && task.number"
-                        class="text-sm font-medium text-primary-500"
-                    >
-                        {{ task.project.code }}-{{ task.number }}
-                    </span>
+                    <div class="flex items-center gap-1.5">
+                        <Icon
+                            v-if="task.clientTicket"
+                            name="heroicons:user-circle"
+                            class="h-4 w-4 text-blue-400"
+                            :title="$t('clientTicket.linkedTooltip', { number: 'CT-' + String(task.clientTicket.number).padStart(3, '0') })"
+                        />
+                        <span
+                            v-if="task.project && task.number"
+                            class="text-sm font-medium text-primary-500"
+                        >
+                            {{ task.project.code }}-{{ task.number }}
+                        </span>
+                    </div>
                 </div>
             </div>
             <p