fix(properties): harden recovery and window chrome

src/utils/propertiesFooter.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, it } from 'vitest';
+import { getPropertiesFooterActions } from './propertiesFooter';
+
+describe('Properties footer state', () => {
+  it('shows discard, save, and close for ordinary dirty edits', () => {
+    expect(getPropertiesFooterActions({ isDirty: true, hasUnsavedNavigation: false }))
+      .toEqual(['discardChanges', 'save', 'close']);
+  });
+
+  it('shows discard, save, and keep editing for an unsaved tab or close prompt', () => {
+    expect(getPropertiesFooterActions({ isDirty: true, hasUnsavedNavigation: true }))
+      .toEqual(['discardChanges', 'save', 'keepEditing']);
+    expect(getPropertiesFooterActions({ isDirty: false, hasUnsavedNavigation: true }))
+      .toEqual(['discardChanges', 'save', 'keepEditing']);
+  });
+
+  it('keeps close available when there are no edits', () => {
+    expect(getPropertiesFooterActions({ isDirty: false, hasUnsavedNavigation: false }))
+      .toEqual(['close']);
+  });
+});