[backport release/v0.17.0] fix(web): surface BYOK migration validation errors #16993

Job	Run time
Resolve runner profiles	45s
Detect validation scopes	13s
Static gate	14s
Preflight	2m 51s
Workspace unit tests	1m 11s
Web workspace tests	5m 45s
E2E Vitest	5m 1s
UI P0 (project-workspace)	9m 57s
UI P0 (workspace-restoration)	8m 41s
Playwright visual (settings-workspace)	3m 58s
UI P0 (project-runtime)	7m 25s
UI P0 (entry-settings)	7m 31s
Playwright visual (entry-navigation)	4m 19s
Playwright critical (${{ matrix.group }})	0s
Windows tools-pack payload tests	0s
Validate workspace	3s
Runtime summary	5s
	57m 59s

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