fix(ui): pin session clock in prepare button-label test to prevent ModDate second-boundary flake

crates/ui-egui/src/dialogs.rs

@@ -1387,6 +1387,7 @@ fn dialogs(app: &mut PdfCraftApp, ctx: &egui::Context) {
         app.props_draft = None;
         app.view_draft = None;
         app.bulk_field_props = None;
+        app.field_props = None;
     } else {
         app.dialog = Some(next);
     }

crates/ui-egui/tests/prepare.rs

@@ -254,6 +254,8 @@ fn options_tab_sets_the_check_box_style() {
 fn button_label_is_editable_without_renaming_the_field() {
     use pdfcraft_engine::{Edit, NewField};
     let mut h = harness();
+    // Saves stamp /ModDate from the clock; pinned, two saves compare equal across a second.
+    h.state_mut().session = std::mem::take(&mut h.state_mut().session).with_clock(|| 1_700_000_000);
     h.state_mut().apply_edit(Edit::AddField {
         page: 0,
         rect: [40.0, 300.0, 190.0, 330.0],