Add ticket types, move Asiakaspalvelu tab first, hide closed tickets

- Asiakaspalvelu tab moved to first position in navigation
- Added ticket type field (Laskutus, Tekniikka, Vika, Muu) with
  type filter dropdown and type column in ticket list
- Type selector in ticket detail view with API endpoint
- Closed tickets hidden by default (selectable via "Kaikki tilat")
- Käsittelyssä rows highlighted with green background
- Type badges with color coding per category

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

style.css

@@ -1124,6 +1124,45 @@ span.empty {
     color: #555;
 }
 
+/* Ticket type badges */
+.ticket-type {
+    display: inline-block;
+    padding: 2px 10px;
+    border-radius: 10px;
+    font-size: 0.75rem;
+    font-weight: 600;
+    white-space: nowrap;
+}
+
+.ticket-type-laskutus {
+    background: #e8f5e9;
+    color: #2e7d32;
+}
+
+.ticket-type-tekniikka {
+    background: #e3f2fd;
+    color: #1565c0;
+}
+
+.ticket-type-vika {
+    background: #fce4ec;
+    color: #c62828;
+}
+
+.ticket-type-muu {
+    background: #f5f5f5;
+    color: #757575;
+}
+
+/* Active (käsittelyssä) ticket row — green tint */
+.ticket-row-active {
+    background: #e8f8e8 !important;
+}
+
+.ticket-row-active:hover {
+    background: #d5f0d5 !important;
+}
+
 /* Ticket thread */
 .ticket-thread {
     display: flex;