feat: "Email sent" column and per-event copy-to-organizer BCC

Organizers had no way to see whether a ticket email went out short of
reading the Postfix journal, and no copy of what the attendee received —
LNbits submits over SMTP, so nothing lands in a Sent folder.

- Admin ticket table gains an "Email sent" column derived from
  `extra.email_notification_sent` ("✓ sent" / "not sent" / "unpaid" /
  "no email").
- `extra.copy_to_organizer`: BCC every ticket email to the event's
  reply-to address (explicit, else the owner's account email) on the SMTP
  envelope only — no Bcc/To header, and skipped when the buyer *is* that
  address. Toggle sits with the other delivery switches in the admin form.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EYwoAkZZmXMMmaBp4WGUBo

static/js/index.js

@@ -133,6 +133,19 @@ window.PageEvents = {
           {name: 'event', align: 'left', label: 'Event', field: 'event'},
           {name: 'name', align: 'left', label: 'Name', field: 'name'},
           {name: 'email', align: 'left', label: 'Email', field: 'email'},
+          {
+            name: 'email_sent',
+            align: 'left',
+            label: 'Email sent',
+            field: row =>
+              !row.email
+                ? 'no email'
+                : row.extra?.email_notification_sent
+                  ? '\u2713 sent'
+                  : row.paid
+                    ? 'not sent'
+                    : 'unpaid'
+          },
           {
             name: 'registered',
             align: 'left',
@@ -207,6 +220,7 @@ window.PageEvents = {
             payment_methods: ['lightning'],
             promo_codes: [],
             organizer_name: '',
+            copy_to_organizer: false,
             reply_to_email: '',
             notification_subject: '',
             notification_body: ''
@@ -585,6 +599,7 @@ window.PageEvents = {
             nostr_notifications: false,
             promo_codes: [],
             organizer_name: '',
+            copy_to_organizer: false,
             reply_to_email: '',
             notification_subject: '',
             notification_body: ''
@@ -607,6 +622,7 @@ window.PageEvents = {
           nostr_notifications: false,
           promo_codes: [],
           organizer_name: '',
+          copy_to_organizer: false,
           reply_to_email: '',
           notification_subject: '',
           notification_body: ''