fix(new-task): attach date in a single create_task call to prevent loss

The new-task bottom sheet called createTask then, if a date was set,
made a follow-up updateTask to attach the date. If the update failed
(e.g. filesystem error between the two writes) the user was left with
a dateless task and, because transient sync errors are already
suppressed, often no visible error either.

Extend the create_task Tauri command to accept optional date/has_time
fields and pass them through. The frontend now creates the task in one
round-trip. No separate update path needed.

apps/tauri/src-tauri/src/lib.rs

@@ -374,6 +374,8 @@ fn create_task(
     title: String,
     description: Option<String>,
     parent_id: Option<String>,
+    date: Option<chrono::DateTime<chrono::Utc>>,
+    has_time: Option<bool>,
     state: State<'_, Mutex<AppState>>,
 ) -> Result<Task, String> {
     let mut s = lock_state(&state)?;
@@ -388,6 +390,11 @@ fn create_task(
         let parent_uuid = Uuid::parse_str(&pid).map_err(|e| e.to_string())?;
         task.parent_id = Some(parent_uuid);
     }
+    // Accept the date fields at creation time so callers don't have to do a
+    // second update() round-trip just to attach a date — which previously
+    // dropped the date entirely if the follow-up update failed.
+    task.date = date;
+    task.has_time = has_time.unwrap_or(false);
     repo_mut(&mut s)?
         .create_task(id, task)
         .map_err(|e| e.to_string())

apps/tauri/src/lib/components/NewTaskInput.svelte

@@ -17,10 +17,15 @@
 
   async function handleSubmit() {
     if (!title.trim()) return;
-    const created = await app.createTask(title.trim(), description.trim() || undefined);
+    // Pass date/has_time into createTask directly so the date can't be lost
-    if (date && created) {
+    // if a second round-trip to update() failed after the create succeeded.
-      await app.updateTask({ ...created, date: date, has_time: dateHasTime });
+    await app.createTask(
-    }
+      title.trim(),
+      description.trim() || undefined,
+      undefined,
+      date,
+      dateHasTime,
+    );
     title = "";
     description = "";
     date = null;

apps/tauri/src/lib/stores/app.svelte.ts

@@ -261,7 +261,13 @@ async function deleteList(id: string) {
   }
 }
 
-async function createTask(title: string, description?: string, parentId?: string): Promise<Task | null> {
+async function createTask(
+  title: string,
+  description?: string,
+  parentId?: string,
+  date?: string | null,
+  hasTime?: boolean,
+): Promise<Task | null> {
   if (!activeListId) return null;
   try {
     const task = await invoke<Task>("create_task", {
@@ -269,6 +275,8 @@ async function createTask(title: string, description?: string, parentId?: string
       title,
       description: description ?? "",
       parentId: parentId ?? null,
+      date: date ?? null,
+      hasTime: hasTime ?? false,
     });
     tasks = parentId ? [task, ...tasks] : [...tasks, task];
     error = null;