A shop can be renamed and, while empty, removed - from head office

The display name was always meant to be editable and the slug frozen;
until now neither had a way in. PATCH /api/sites/{site} takes a name
and a timezone (manager and above), DELETE removes an empty shop
(owner). The shop drawer in head office gets both, with the short name
shown read-only and the reason beside it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KGcjxF1cNLcuwc3DAPcnfj

web/src/styles.css

@@ -568,3 +568,7 @@ button.ghost.danger:hover { border-color: var(--bad); }
              letter-spacing: .04em; text-transform: uppercase; }
 
 .ask-btn .mark { width: 18px; height: 18px; }
+
+.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
+button.ghost.danger { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 40%, transparent); }
+input[readonly] { opacity: .6; }