sessionScopeDirectory() always returned null and ignored its home arg, so
the scope plumbing in loadSessions/createSession was dead: scopeDir was
always null, listClient always the default client, and the lazy path.get()
fetch fed only that dead branch. Collapse both call sites to use the
connection's default client directly and delete the now-orphaned
sessionScope.ts helper and its test.
serverHome is intentionally KEPT in connections.ts: it is still consumed by
the directory switcher UI (DirectorySwitcher.tsx, app/(tabs)/index.tsx) for
~ path expansion, so it is not dead code.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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