fix: warn before the delete, not after — plus round-2 copy and a11y corrections

Round 2 on the feature diff (15 → 12):

- still_allowed_by_env now rides the invite LIST as well as the delete response,
  so the confirmation warns while the admin can still change their mind. It
  mattered most for a DENIED row on an env-allow-listed address: deleting it
  silently converted a refusal into a grant, and the only warning arrived after
  the irreversible click.
- Both inbox bodies claimed to name "the most recent" dropped message. The
  throttle records the FIRST of each hour and never updates it, so they now say
  "one of them", and the not-configured body finally names where to fix it.
- settings.invites.emailOff told the admin they "get no notice when someone
  signs up" — rendered directly above the queue that shows exactly that. Only
  the email is lost, and it now says so.
- The disabled delete buttons put their reason out of reach: `disabled` drops a
  control from the tab order and suppresses its title. Switched to
  aria-disabled + preventDefault, the pattern Playlists.tsx already established
  for the same reason.
- deleteInvite is quiet, so the 409 the UI handles with a translated toast no
  longer also raises the server's English detail as a modal.
- After a completed password reset, Back landed on the reset form again with a
  consumed token — the history change made that state reachable. The token is
  cleared on success so the reset view stops being the card's root.
- The hu deleteHasAccount named a tab that renders under a different label.

Tests: a dom test for the Access-requests panel covering both has_account
variants and all three delete outcomes, /api/me flag cases, an ADMIN_EMAILS
case, and the env-allowlist test now patches the raw setting so the parsing
stays under test.

frontend/src/components/AdminUsers.tsx

@@ -322,10 +322,17 @@ function AdminInvites() {
       if (conflict) refresh();
     },
   });
-  const onDelete = async (i: { id: number; email: string }) => {
+  const onDelete = async (i: Invite) => {
     const ok = await confirm({
       title: t("settings.invites.deleteTitle"),
-      message: t("settings.invites.deleteConfirm", { email: i.email }),
+      // Removing the row is not a revoke when the address is also in the server's env allow-lists —
+      // say so while the admin can still change their mind, not in a toast after the fact.
+      message: t(
+        i.still_allowed_by_env
+          ? "settings.invites.deleteConfirmStillAllowed"
+          : "settings.invites.deleteConfirm",
+        { email: i.email },
+      ),
       confirmLabel: t("settings.invites.delete"),
       danger: true,
     });
@@ -410,9 +417,12 @@ function AdminInvites() {
                 {/* An entry with an account behind it stays read-only: deleting it would revoke that
                     user's access, since is_allowed reads this row. Delete the user instead. */}
                 {i.has_account ? (
+                  // `disabled` would drop it from the tab order AND suppress the title, so the
+                  // reason reached nobody — same call as the Playlists drag handle.
                   <button
                     type="button"
-                    disabled
+                    aria-disabled
+                    onClick={(e) => e.preventDefault()}
                     title={t("settings.invites.deleteHasAccount")}
                     aria-label={t("settings.invites.deleteHasAccount")}
                     className="shrink-0 p-1 text-muted/50 cursor-not-allowed"
@@ -615,9 +625,11 @@ function InviteRow({
           instead — shown as a disabled control rather than omitted, or the admin sees a row that is
           silently missing a button their other rows have. */}
       {inv.has_account ? (
+        // aria-disabled, not `disabled`: the reason has to stay reachable by keyboard.
         <button
           type="button"
-          disabled
+          aria-disabled
+          onClick={(e) => e.preventDefault()}
           title={t("settings.invites.deleteHasAccount")}
           aria-label={t("settings.invites.deleteHasAccount")}
           className="shrink-0 p-1.5 rounded-lg border border-border/50 text-muted/50 cursor-not-allowed"