Tests: pin the session clock in the bookmark-search test, whose two full saves differed when a second ticked between them

save_full_bytes stamps /ModDate from the session clock, so the 'search doesn't
edit the PDF' comparison failed whenever the two saves straddled a second
boundary (seen under a loaded full workspace run).

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

crates/ui-egui/tests/bookmarks.rs

@@ -145,6 +145,9 @@ fn search_finds_collapsed_bookmarks_and_keeps_original_paths() {
     h.run_steps(3);
     assert!(h.query_by_label("Résumé results").is_none());
     let id = h.state().views[0].id;
+    // A full save stamps /ModDate from the clock: pin it, or two saves a second apart differ.
+    let session = std::mem::take(&mut h.state_mut().session);
+    h.state_mut().session = session.with_clock(|| 1_700_000_000);
     let before = h.state().session.save_full_bytes(id).unwrap();
     h.get_by_label("Search").click();
     h.run_steps(1);