fix(tasks): hide populated v-row when task list is empty

The populated state's v-row had no v-if guard, so when the task list was
empty it still rendered (just without children) — taking ~16-24px of
vertical space (pa-2 + default v-row margins) on top of the empty-state
row below. Empty-state card now sits at the same top position as the
populated cards (and /task form card).

Author: PierreBrisorgueil

src/modules/tasks/views/tasks.view.vue

@@ -15,7 +15,7 @@
         </v-btn>
       </template>
     </PageHeader>
-    <v-row class="pa-2 mt-0">
+    <v-row v-if="tasks && tasks.length" class="pa-2 mt-0">
       <taskComponent v-for="(item, index) in tasks" :key="item.id" :item="item" :index="index"></taskComponent>
     </v-row>
     <v-row v-if="!tasks || !tasks.length" class="pa-2 mt-0">