feat(web): open a task

TaskRow has had an onedit prop that nothing passed. There was no way to
see a task's description, sub-tasks, comments, files or reminders, all of
which the API has supported from the start.

A drawer rather than a page, so the list you came from stays behind it
and ticking a sub-task off and closing lands you where you were rather
than at the top of a re-fetched list. Mounted in the root layout and
driven by an id in the store, so a task opens the same way from Today, a
project, a label or a saved filter — and so an edit arriving over the
socket reaches the drawer without a second source of truth to keep in
step.

Text fields save on blur. A PATCH per keystroke is forty requests for one
sentence, and the last to arrive is not necessarily the last one sent.

The navigation shortcuts are suppressed while it is open: with a task in
front of you, "t" means the letter t.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

web/src/lib/components/TaskRow.svelte

@@ -72,7 +72,9 @@
 		</svg>
 	</button>
 
-	<button class="body" onclick={() => onedit?.(task)}>
+	<!-- Opening the detail drawer is the default. `onedit` is for the callers that
+	     want the click to mean something else. -->
+	<button class="body" onclick={() => (onedit ? onedit(task) : app.openDetail(task.id))}>
 		<span class="content">{task.content}</span>
 
 		{#if task.description}