fix(viewer): stabilize retained HTML previews #19166

Job	Run time
Resolve runner profiles	12s
Static gate	17s
Detect validation scopes	18s
Preflight	2m 2s
E2E Vitest	3m 19s
Web workspace tests (1/2)	3m 13s
Windows tools-pack payload tests	3m 32s
UI P0 (project-collab)	3m 25s
UI P0 (project-workspace)	3m 35s
Web workspace tests (2/2)	2m 44s
Playwright visual (settings-workspace)	3m 25s
UI P0 (entry-settings)	6m 5s
Workspace unit tests	1m 6s
Playwright visual (entry-navigation)	2m 40s
UI P0 (project-workspace-editor)	4m 26s
UI P0 (workspace-restoration)	3m 55s
UI P0 (project-runtime)	4m 32s
Daemon tests (${{ matrix.shard }}/4)	0s
Playwright critical (${{ matrix.group }})	0s
Validate workspace	3s
Runtime summary	4s
	48m 53s

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