ui: simplify header with logo, auto-refresh on by default

- When company logo is set, show only "Hallintapaneeli" without
  company name (logo identifies the company)
- Ticket auto-refresh checkbox is checked by default
- Auto-refresh starts when switching to support tab

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

index.html

@@ -276,7 +276,7 @@
                         </label>
                         <button class="btn-secondary" id="btn-ticket-rules" style="padding:7px 14px;font-size:0.82rem;">&#9881; Säännöt</button>
                         <label style="display:flex;align-items:center;gap:0.4rem;font-size:0.82rem;color:#777;cursor:pointer;white-space:nowrap;margin-left:auto;">
-                            <input type="checkbox" id="ticket-auto-refresh"> Autopäivitys
+                            <input type="checkbox" id="ticket-auto-refresh" checked> Autopäivitys
                             <select id="ticket-refresh-interval" style="padding:3px 6px;border:1px solid #ddd;border-radius:5px;font-size:0.8rem;">
                                 <option value="30">30s</option>
                                 <option value="60" selected>1 min</option>