Two user-reported signin bugs:
1) A plain re-login (or logout→login) wiped the user's YouTube grant: login requests
only BASE_SCOPES and Google's returned `scope` can list just those, but _store_token
wrote it verbatim — dropping a previously-granted youtube.readonly/youtube scope, so
can_read flipped to false and the feed demanded a reconnect. The underlying grant
(refresh token) survives such a login, so UNION the scopes instead of narrowing; they
only shrink on full disconnect (purge deletes the token row).
2) Admin 'new access request' email: (a) it named the wrong menu ('Settings → Account'
instead of Users → Access requests); (b) the requester address was invisible so the
'reply reaches them' note looked wrong (Reply-To is in fact set to the requester) —
now spelled out + a deep-link straight to the approve view (?admin=access-requests,
handled in App); (c) it emailed only the static env ADMIN_EMAILS — now notifies the
ACTUAL admins (active role=admin users) unioned with env, so a UI-promoted admin (who
CAN approve — the approve UI is role-gated) is notified too.
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