fix(viewer): preserve live HTML previews #19268

Job	Run time
Resolve runner profiles	10s
Detect validation scopes	25s
Static gate	15s
Workspace unit tests	46s
Web workspace tests (2/2)	2m 45s
Preflight	1m 51s
E2E Vitest	3m 7s
Daemon tests (3/4)	2m 33s
Web workspace tests (1/2)	3m 8s
Daemon tests (4/4)	2m 49s
Daemon tests (2/4)	2m 49s
Playwright visual (settings-workspace)	3m 18s
Daemon tests (1/4)	3m 2s
Playwright visual (entry-navigation)	2m 38s
UI P0 (project-runtime)	4m 23s
UI P0 (workspace-restoration)	3m 45s
UI P0 (project-workspace)	3m 37s
UI P0 (entry-settings)	5m 42s
UI P0 (project-workspace-editor)	6m 56s
UI P0 (project-collab)	3m 19s
Windows tools-pack payload tests	0s
Playwright critical (${{ matrix.group }})	-1s
Validate workspace	2s
Runtime summary	4s
	57m 23s

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