fix: Ensure necessary namespaces are in patched doc (#2698)

* refactor: Extract timestamp properties

In preparation for reworking DocumentAttributes.

* refactor: Consolidate namespaces

* fix: Ensure necessary namespaces are in patched doc

Fixes #2697

* Fix tsc and ESLint errors

* Fix CSpell

* Add a test to fix code coverage failure

src/file/styles/external-styles-factory.spec.ts

@@ -144,6 +144,10 @@ describe("External styles factory", () => {
             expect(() => new ExternalStylesFactory().newInstance(`<?xml version="1.0" encoding="UTF-8" standalone="yes"?><foo/>`)).to.throw(
                 "can not find styles element",
             );
+
+            expect(() => new ExternalStylesFactory().newInstance(`<?xml version="1.0" encoding="UTF-8" standalone="yes"?>`)).to.throw(
+                "can not find styles element",
+            );
         });
 
         it("should parse styles elements", () => {