feat(router, sidebar, modal): add 'Tasks Concepts' route and update sidebar/menu items; enhance task modal save functionality

app/src/plugins/tm@modal/task/z-task-modal.vue

@@ -273,12 +273,18 @@
           />
         </v-card-actions>
 
-        <v-btn class="button primary" v-if="!isSaving" @click="save()">{{
+        <v-btn class="button primary" :disabled="isSaving" @click="save()">{{
           subtask.id ? 'UPRAVIŤ' : 'VYTVORIŤ'
         }}</v-btn>
-        <v-btn class="button primary disabled" v-else disabled>{{
-          $t('Ukladám...')
-        }}</v-btn>
+
+        <template v-if="!subtask.id">
+          <v-btn
+            class="button primary outline mt-2"
+            @click="save()"
+            :disabled="isSaving"
+            >ULOŽIŤ KONCEPT</v-btn
+          >
+        </template>
       </v-card>
 
       <v-card v-else height="100%" class="d-flex flex-column scrolling">
@@ -699,7 +705,7 @@ export default {
       }
     },
 
-    async save() {
+    async save(concept = false) {
       this.wasFormValidationTriggered = true;
       if (!(await this.validateAllFields())) return;
 
@@ -731,9 +737,14 @@ export default {
               };
             });
 
+          const payload = { ...this.subtask, timesheets, timeblocks };
+          if (concept) {
+            payload.concept = true;
+          }
+
           const { subtask } = await this.$axios.patch_auth_form(
             `v1/subtasks/${this.subtask.id}`,
-            { ...this.subtask, timesheets, timeblocks },
+            payload,
           );
           localStorage.removeItem('subtaskData');
 
@@ -765,6 +776,9 @@ export default {
             ...this.subtask,
             employees: validEmployees,
           };
+          if (concept) {
+            subtaskCopy.concept = true;
+          }
           delete subtaskCopy._master_task;
           const { subtasks } = await this.$axios.post_auth(
             `v1/mastertasks/${this.subtask.master_task_id}/subtasks`,