fix(auth): stop the address-bar mirror eating emailed auth tokens, and unlock revoked accounts

Two independent bugs made an email+password registration unrecoverable in prod.

The verification link did nothing. urlWithParams/clearParams rebuilt the URL as
pathname+query and dropped the fragment — but the one-time auth tokens ride the
fragment (#verify=/#reset=, SB3), and the providers that mirror nav params
(useUrlMirror in FeedFilters/Playlists/Plex/Channels) sit ABOVE the lazily-loaded
<App> in main.tsx. Their mount effect replaceState'd the token away before the auth
card's chunk had loaded, so the card read an empty hash: the link opened a bare
sign-in page, no request, no banner. Both helpers now carry the fragment over.

The account was then locked out for good. SEC-10 nulls password_hash when an
unverified account is attested (here: admin approval landing before the user could
verify — which the bug above made impossible). That is indistinguishable from a
Google-only account, and reset eligibility keyed off password_hash alone, so no
reset link was ever issued: no password to sign in with, and no way to get one.
users.password_revoked_at records the revocation, reset eligibility honours it, and
setting a password again (reset-confirm or set-password) clears it. An account that
never had a password stays ineligible on purpose — its owner adds one from Settings.

/auth/verify now also answers password_reset_required so the card can say why the
registered password stopped working, instead of leaving the user at the uniform
"Invalid email or password". Telling the holder of a valid verify token leaks
nothing: they have already proved they own the mailbox.

The 0078 migration backfills the stamp for rows carrying the exact lockout signature
(local, non-demo, no password, unverified), so existing victims recover unaided.

frontend/src/i18n/locales/en/welcome.json

@@ -86,6 +86,8 @@
     "forgotDone": "If that email has an account, we've sent a reset link. Check your inbox.",
     "resetDone": "Your password has been set — you can sign in now.",
     "verifyOk": "Email confirmed. Once an admin approves your account, you can sign in.",
+    "verifyOkReset": "Email confirmed. Your account was approved before you confirmed it, so the password you registered with was cleared for security — choose a new one to sign in.",
+    "verifyOkResetCta": "Set a new password",
     "verifyInvalid": "That verification link is invalid or has expired.",
     "resendCta": "Send a new link",
     "resendDone": "If that email has an unverified account, we've sent a new verification link. Check your inbox.",

frontend/src/i18n/locales/hu/welcome.json

@@ -86,6 +86,8 @@
     "forgotDone": "Ha ehhez az e-mailhez tartozik fiók, elküldtük a visszaállító linket. Nézd meg a postafiókod.",
     "resetDone": "A jelszavad be van állítva — most már beléphetsz.",
     "verifyOk": "E-mail megerősítve. Amint egy admin jóváhagyja a fiókodat, beléphetsz.",
+    "verifyOkReset": "E-mail megerősítve. A fiókodat még a megerősítés előtt jóváhagyták, ezért biztonsági okból töröltük a regisztrációkor megadott jelszavadat — válassz újat a belépéshez.",
+    "verifyOkResetCta": "Új jelszó beállítása",
     "verifyInvalid": "Ez a megerősítő link érvénytelen vagy lejárt.",
     "resendCta": "Új link küldése",
     "resendDone": "Ha ehhez az e-mailhez tartozik megerősítetlen fiók, elküldtünk egy új megerősítő linket. Nézd meg a postafiókod.",