[VargaJoe]

AdminUI's repository chooser still showed an obsolete demo action and a generic welcome, while remembered repositories appeared as bare URLs. Replace it with a compact URL + Continue form and a manageable list of remembered connections.

• Show every pinned connection and the six most recently used unpinned connections, with Show all / Show fewer and no duplicates.
• Add browser-local display names, pin/unpin, and Remove from this list with Undo. Keep the exact repository URL visible.
• Store connection metadata separately from authentication sessions. Import existing SNAuth history once; removing a list entry does not clear credentials or sign the user out, and logout does not erase connection history.
• Remember successful openings across SNAuth, IdentityServer and Local authentication. Token renewal preserves the connection timestamp. Connection discovery errors retain the address for editing and retry.
• Remove the demo/welcome/helper copy, add English/Hungarian labels, and preserve keyboard focus and narrow layouts.

Existing repository restoration, authentication routing and callback policy are preserved.

Validation at 20a079c:

• 154/154 focused chooser, storage, provider and authentication regression tests passed across 15 suites.
• Actual isolated Chrome against the local app passed selection-list actions, rename, removal/Undo, reload persistence, cross-tab updates, URL validation and retained failure input. Layouts at 320, 390, 736 and 1024 px had no horizontal overflow or page errors. The network-failure case used an aborted request; this was not new live identity-provider acceptance.
• SNAuth and IdentityServer production webpack builds passed with existing asset-size warnings.
• Scoped ESLint had no errors; three pre-existing SNAuth hook warnings remain. Formatting, diff checks and commit hooks passed.
• Independent code review found and fixed a malformed-scheme URL validation issue; final review reports no blockers and independently passed 55 targeted tests.

No merge or deployment is included.

[VargaJoe]

Independent Codex code review of 20a079c against 81aca15: no remaining merge-blocking findings. The malformed-scheme URL validation issue found during review is fixed and regression-tested. Reviewed connection migration/removal and credential isolation, provider timestamps and failure recovery, list behavior, localization and keyboard focus. Independent targeted rerun: 55/55 passed.

Code-review verdict: GO for this change. This is separate from colleagues' approval and the full CI result.

Validation: 154/154 focused tests, both SNAuth/IdentityServer production builds, and actual isolated Chrome chooser interactions/reload/cross-tab/layout checks passed. The browser network-failure case was simulated; no new live IdP acceptance is claimed.

Full-repository CI is not green: https://github.com/SenseNet/sn-client/actions/runs/42254185965 . Both jobs fail at yarn build before lint/AdminUI build, in unchanged packages/sn-pickers-react: unused React in context/selection.tsx, missing @material-ui/lab/TreeItem and TreeView in picker-advanced.tsx, and implicit-any parameters there. This PR changes no picker sources, dependency manifests, lockfile or workflow. The PR preview workflow is still running.

Merge remains owner-controlled.