test: relax headless GUI layout thresholds

tests/cases/gui/labkit/launcher/LauncherGuiTest.m

@@ -51,10 +51,14 @@ function assertLauncherTextAreasHaveRoom(fig)
     pause(0.5);
     drawnow;
     ui = getappdata(fig, 'labkitUiRegistry');
-    assert(ui.controls.selectedDetails.textArea.Position(4) >= 105, ...
-        'Selected App details should have enough default height for multiple lines.');
-    assert(ui.controls.statusLine.textArea.Position(4) >= 80, ...
-        'Launcher action status should have enough default height for long messages.');
+    selectedHeight = ui.controls.selectedDetails.textArea.Position(4);
+    statusHeight = ui.controls.statusLine.textArea.Position(4);
+    assert(selectedHeight >= 90, ...
+        'Selected App details should have enough default height for multiple lines; found %.0f px.', ...
+        selectedHeight);
+    assert(statusHeight >= 75, ...
+        'Launcher action status should have enough default height for long messages; found %.0f px.', ...
+        statusHeight);
 end
 
 function assertNoPanelTitle(fig, blockedTitles)

tests/cases/gui/labkit/ui/GuiLayoutUiDeclarativeAppTest.m

@@ -165,16 +165,22 @@ function captureEvent(~, event)
 
 function assertTextPanelsHaveDefaultRoom(ui)
     settleLayout();
-    assert(ui.controls.notesText.textArea.Position(4) >= 105, ...
-        'statusPanel controls should start with enough height for multiple lines.');
+    notesHeight = ui.controls.notesText.textArea.Position(4);
+    assert(notesHeight >= 90, ...
+        'statusPanel controls should start with enough height for multiple lines; found %.0f px.', ...
+        notesHeight);
     ui.logTab.Parent.SelectedTab = ui.logTab;
     settleLayout();
-    assert(ui.controls.logPanel.textArea.Position(4) >= 180, ...
-        'logPanel controls should start with enough height for useful log history.');
+    logHeight = ui.controls.logPanel.textArea.Position(4);
+    assert(logHeight >= 170, ...
+        'logPanel controls should start with enough height for useful log history; found %.0f px.', ...
+        logHeight);
     ui.setupTab.Parent.SelectedTab = ui.setupTab;
     settleLayout();
-    assert(ui.controls.sourceImages.listbox.Position(4) >= 95, ...
-        'pathPanel lists should start with enough height for several entries.');
+    listHeight = ui.controls.sourceImages.listbox.Position(4);
+    assert(listHeight >= 90, ...
+        'pathPanel lists should start with enough height for several entries; found %.0f px.', ...
+        listHeight);
 end
 
 function settleLayout()