fix(desktop): app zoom no longer zooms the preview browser - #6649

💭 I'm checking the modified files to understand the coding conventions being used, particularly looking at the new reapplyZoom and assertTabZoom methods to see how they fit into the existing patterns. Now I'm checking the new zoom-related methods in Manager.ts and how DesktopWindow.ts uses the preview manager's zoom functionality. I'm trying to trace where previewManager originates in the DesktopWindow constructor—it's likely coming from yield* PreviewManager.PreviewManager, so let me verify that. Looking at the service interface declaration, reapplyZoom is defined as a function that returns an Effect with no value, and it's wired up in the test file through a test seam in the PreviewManager layer setup. Scanning through the rest of the interface and test conventions — the error handling uses the existing attempt pattern, Effect.ignore is applied consistently in places like assertTabZoom, and the test layer construction with Layer.succeed is standard for test doubles. The imports from "effect" look properly consolidated across the test files, and no consumer updates are needed since this is an internal service addition. The test layer for PreviewManager in DesktopWindow.test.ts uses a test seam through Layer.succeed, which is acceptable. I'm not seeing any new error classes or Layer.succeed calls in production code. One pattern I notice is attempt(...).pipe(Effect.ignore) in assertTabZoom that silently swallows failures, which isn't explicitly listed as a convention. Everything checks out cleanly. I need to return JSON matching the schema with a success state and "All clear" as the summary, since the audit found no issues despite checking for defaults to failure.