semantic markup update

frontend/src/routes/tasks/+page.svelte

@@ -13,6 +13,11 @@
   let showBackupModal = false;
   let selectedEnvId = '';
 
+  // [DEF:loadInitialData:Function]
+  /* @PURPOSE: Loads tasks and environments on page initialization.
+     @PRE: API must be reachable.
+     @POST: tasks and environments variables are populated.
+  */
   async function loadInitialData() {
     try {
       loading = true;
@@ -28,7 +33,13 @@
       loading = false;
     }
   }
+  // [/DEF:loadInitialData:Function]
 
+  // [DEF:refreshTasks:Function]
+  /* @PURPOSE: Periodically refreshes the task list.
+     @PRE: API must be reachable.
+     @POST: tasks variable is updated if data is valid.
+  */
   async function refreshTasks() {
     try {
       const data = await getTasks();
@@ -40,11 +51,23 @@
       console.error('Failed to refresh tasks:', error);
     }
   }
+  // [/DEF:refreshTasks:Function]
 
+  // [DEF:handleSelectTask:Function]
+  /* @PURPOSE: Updates the selected task ID when a task is clicked.
+     @PRE: event.detail.id must be provided.
+     @POST: selectedTaskId is updated.
+  */
   function handleSelectTask(event) {
     selectedTaskId = event.detail.id;
   }
+  // [/DEF:handleSelectTask:Function]
 
+  // [DEF:handleRunBackup:Function]
+  /* @PURPOSE: Triggers a manual backup task for the selected environment.
+     @PRE: selectedEnvId must not be empty.
+     @POST: Backup task is created and task list is refreshed.
+  */
   async function handleRunBackup() {
     if (!selectedEnvId) {
       addToast('Please select an environment', 'error');
@@ -61,6 +84,7 @@
       console.error('Failed to start backup:', error);
     }
   }
+  // [/DEF:handleRunBackup:Function]
 
   onMount(() => {
     loadInitialData();