fix(tui): preserve preview when sidebar target is stale

[lawrencecchen]

Follow-up for #11101.

Validate the target surface before committing workspace preview state. A closed or replaced target now leaves the existing preview and selection unchanged. Includes a regression test. Exact hosted gate and canonical autoreview are pending.

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Summary by cubic

Validates the complete sidebar target (workspace, screen, pane, and tab index) before committing a workspace preview, so a stale click on a closed, replaced, or moved tab is now a no-op instead of selecting a different surface. Extends this guard to rendered tab hits and includes regression tests.

^{Written for commit e9a1755. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
cmux166	Ready	Preview	Aug 28, 2026 11:56pm
cmux41	Ready	Preview	Aug 28, 2026 11:56pm

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