Add ticket status setter and prevent draft text loss

- Set ticket state (Offen / In Bearbeitung / Warten auf Schließen /
  Geschlossen) from the ticket detail page via a live PUT to Zammad;
  pending-close gets a default pending time and the change is synced back
  so it isn't flagged as an external change
- Replace the disruptive meta-refresh with a JS auto-refresh that pauses
  while a text field has unsent content or focus
- Persist reply/new-ticket drafts to localStorage and restore them after
  a reload or accidental navigation

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

static/style.css

@@ -136,6 +136,10 @@ table.tickets tr.row-unseen td:first-child { box-shadow: inset 3px 0 0 var(--acc
 .state-new { background: #fff3d6; color: #8a6300; }
 [class^="state-"].state-pending\ reminder, .state-pending { background: #e6f0fd; color: #1c54a8; }
 
+.state-form { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; padding: 0 1.1rem 1rem; }
+.state-form label { font-size: .85rem; font-weight: 600; color: #44525e; }
+.state-form select { font: inherit; padding: .4rem .55rem; border: 1px solid var(--line); border-radius: 7px; background: #fff; }
+
 .meta { display: grid; grid-template-columns: repeat(2, 1fr); gap: .4rem 2rem; padding: 1rem 1.1rem; margin: 0; }
 .meta div { display: flex; justify-content: space-between; border-bottom: 1px dotted var(--line); padding: .25rem 0; }
 .meta dt { color: var(--muted); margin: 0; }