## Problem
Self-deleting an account via **Settings → Delete account** only called
`markAsDeleted()`. It never checked or cancelled the Stripe
subscription, so a user could delete their account while still
subscribed and **keep getting billed** afterwards. The `user:delete` CLI
command already cancelled the subscription, but the web path never got
that logic.
## Fix
Block account deletion while the user is **on a trial** or holds a
**valid, uncancelled subscription**, and direct them to cancel via the
billing portal first.
- `User::hasActiveSubscriptionOrTrial()` — true on a trial or a
`valid()` subscription; **grace-period** (already-cancelled)
subscriptions are excluded since they won't re-bill, so deletion is
still allowed.
- `ProfileController::destroy()` — rejects with a `subscription` error
before deleting (server-side guard, also covers non-UI calls).
- Delete-account page now receives `hasActiveSubscriptionOrTrial`; when
set, the UI shows a warning + **Manage billing** link and hides the
delete dialog.
- Spanish translations added for the two new strings.
The `user:delete` CLI is unchanged — it keeps its
auto-cancel-with-confirmation flow for admin use.
## Tests
- Active subscription → deletion blocked
- Trialing subscription → deletion blocked
- Grace-period (cancelled) subscription → deletion allowed
- Delete-account page exposes the flag (true/false)
All passing locally, alongside Pint / Prettier / ESLint.
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