ElyMark: renders asked of a failed page end at once (M-08)

The tally remembers why the page went down; until a load succeeds,
render() ends each new request with that reason instead of calling a
dead page. end_renders is a free function with a gpui test.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/ely-mark/src/restore.rs

@@ -201,8 +201,6 @@ fn clear(dir: &Path) -> io::Result<()> {
     }
 }
 
-/// What tab `id` restores: by file, or untitled by number.
-
 impl Desk {
     /// A tab just shown takes its kept mode, place, text.
     pub fn restore_shown(&mut self, id: u64, cx: &mut Context<Self>) {