Add Asiakaspalvelu email ticketing system

IMAP client for fetching emails from asiakaspalvelu@cuitunet.fi,
Freshdesk-style ticket management with status tracking, message
threading, reply/note functionality, and IMAP settings in API tab.

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

style.css

@@ -1088,6 +1088,153 @@ span.empty {
     color: #888;
 }
 
+/* Ticket status badges */
+.ticket-status {
+    display: inline-block;
+    padding: 3px 10px;
+    border-radius: 12px;
+    font-size: 0.75rem;
+    font-weight: 600;
+    letter-spacing: 0.3px;
+    white-space: nowrap;
+}
+
+.ticket-status-uusi {
+    background: #3498db;
+    color: #fff;
+}
+
+.ticket-status-kasittelyssa {
+    background: #f39c12;
+    color: #fff;
+}
+
+.ticket-status-odottaa {
+    background: #f1c40f;
+    color: #333;
+}
+
+.ticket-status-ratkaistu {
+    background: #2ecc71;
+    color: #fff;
+}
+
+.ticket-status-suljettu {
+    background: #bdc3c7;
+    color: #555;
+}
+
+/* Ticket thread */
+.ticket-thread {
+    display: flex;
+    flex-direction: column;
+    gap: 0.75rem;
+    margin: 1.25rem 0;
+    padding: 1rem 0;
+    border-top: 2px solid #f0f2f5;
+    border-bottom: 2px solid #f0f2f5;
+    max-height: 60vh;
+    overflow-y: auto;
+}
+
+.ticket-message {
+    border-radius: 10px;
+    padding: 0.75rem 1rem;
+    position: relative;
+}
+
+.ticket-msg-in {
+    background: #f0f7ff;
+    border-left: 3px solid #3498db;
+}
+
+.ticket-msg-out {
+    background: #eafaf1;
+    border-left: 3px solid #2ecc71;
+}
+
+.ticket-msg-note {
+    background: #fffbea;
+    border-left: 3px solid #f39c12;
+}
+
+.ticket-msg-header {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    margin-bottom: 0.5rem;
+    font-size: 0.82rem;
+    color: #555;
+    flex-wrap: wrap;
+}
+
+.ticket-msg-type {
+    font-size: 0.75rem;
+    font-weight: 600;
+    text-transform: uppercase;
+    letter-spacing: 0.3px;
+    opacity: 0.7;
+}
+
+.ticket-msg-time {
+    margin-left: auto;
+    color: #999;
+    font-size: 0.78rem;
+}
+
+.ticket-msg-body {
+    font-size: 0.9rem;
+    line-height: 1.6;
+    color: #333;
+    white-space: pre-wrap;
+    word-break: break-word;
+}
+
+/* Ticket reply form */
+.ticket-reply-form {
+    padding-top: 1rem;
+}
+
+.ticket-reply-form textarea {
+    width: 100%;
+    padding: 10px 12px;
+    border: 2px solid #e0e0e0;
+    border-radius: 8px;
+    font-size: 0.9rem;
+    font-family: inherit;
+    resize: vertical;
+    transition: border-color 0.2s, box-shadow 0.2s;
+}
+
+.ticket-reply-form textarea:focus {
+    outline: none;
+    border-color: #0f3460;
+    box-shadow: 0 0 0 3px rgba(15, 52, 96, 0.1);
+}
+
+.btn-reply-tab {
+    background: #f0f2f5;
+    border: 2px solid transparent;
+    padding: 6px 14px;
+    border-radius: 8px;
+    font-size: 0.82rem;
+    font-weight: 600;
+    cursor: pointer;
+    color: #888;
+    transition: all 0.15s;
+}
+
+.btn-reply-tab:hover {
+    color: #555;
+    background: #e8ebf0;
+}
+
+.btn-reply-tab.active {
+    color: #0f3460;
+    background: #fff;
+    border-color: #0f3460;
+}
+
 /* Changelog */
 .nowrap {
     white-space: nowrap;