Integrate document-format storage into the editor (#4265)

* Integrate document-format storage into the editor

* Address review feedback: drop redundant clones and dedupe metadata traversal

* Extract DocumentHistory and move storage-metadata tests to their own file

* Extract storage diffing/IO, gate validation and .gdd save behind preferences, restructure tests

* Address PR review: save-format/path consistency, autosave persistence, and view-settings/diff fixes

* Skip storage remount on .gdd open and split value/timestamp drift in attribute diff

* Rename storage tests module and surface .gdd open failures with per-resource diff detail

* Add debug-menu toggle to hide the storage preferences section

* Hopefully fix async tests

* Shorten comments

* Fix tests

* Review

* Review

* Review

* Block on future mesages in tests

* Review

* Shorten comments

---------

Co-authored-by: Timon <me@timon.zip>

editor/src/test_utils.rs

@@ -28,6 +28,10 @@ impl EditorTestUtils {
 
 		editor.handle_message(PortfolioMessage::Init);
 
+		// Enable the dual-write soak validation in tests so storage round-trip drift fails loud, matching
+		// the previous always-on-in-debug behavior now that it is gated by a preference.
+		editor.handle_message(PreferencesMessage::ValidateStorageRoundTrip { enabled: true });
+
 		Self { editor, runtime }
 	}