fix(desktop): restore legacy run detail render path

[Whiteks1]

Closes #427.

Summary

• Restores the legacy kind: "run" render path in renderTabs().
• Reconnects the existing renderRunTab renderer so .run-detail-shell is emitted again.
• Keeps the desktop(migration): run detail and artifact explorer native surfaces #409 artifacts decision intact: artifacts remain integrated into Run Detail via openRunDetailTab(runId, { subview: "artifacts" }); this PR does not restore a separate artifacts: tab surface.

Scope

• In scope: legacy run detail rendering path only.
• Out of scope: general openTab fixes, useLegacyBridge cleanup, React renderer debt, desktop(product): formalize launch target-state and research_ui retirement plan #411/desktop(cleanup): post-v1 legacy shell retirement boundary #412, shell bootstrap rewrites, separate artifacts tab restoration.

Validation

• npm ci passed; it still reports existing dev audit findings (2 moderate, 1 high), not addressed in this slice.
• npm run -s typecheck passed.
• npm run -s build passed.
• npm run -s smoke:fallback passed.
• node --test tests/snapshot-status.test.mjs passed.
• git diff --check passed.

Local real-path note

• npm run -s smoke:real-path now reaches the fixed target state for fix(desktop): resolve shell bootstrap hasShell=false smoke regression #427: happyPathRunDetailReady=true and happyPathArtifactsReady=true.
• Local Windows real-path still exits non-zero because research_ui is not registered as reachable by the smoke service (serverReady=false, apiReady=false, serverUrl=""). That is a separate server reachability/registration condition from the hasShell=false regression fixed here.

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