sessions: keep Changes and Files in aux-only view

[Sandeep Somavarapu (sandy081)]

Summary

• treat the single-pane Aux-only composition as an invariant that always provides the managed Changes and Files inputs
• reconcile on every part visibility transition so Editor+Aux to Aux-only restores a missing Files input
• preserve user-close behavior while the Editor area is visible
• update the single-pane layout specification and regression coverage

Validation

• npm run compile
• npm run hygiene
• npm run typecheck-client
• npm run valid-layers-check
• ./scripts/test.sh --run src/vs/sessions/contrib/layout/test/browser/desktopSessionLayoutController.test.ts --grep "managed tabs" (30 passing)

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[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

Benjamin Christopher Simmonds (@benibenj)

Matched files:

• src/vs/sessions/contrib/layout/browser/singlePane/singlePaneManagedTabsStrategy.ts
• src/vs/sessions/contrib/layout/test/browser/desktopSessionLayoutController.test.ts

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