feat(dashboard): Bongbetic wordmark in header + monogram favicon

- Header now shows the Bongbetic icon + light/dark wordmark (linked to
  bongbetic.com) next to FENRIS — no more lonely "F" placeholder.
- Footer gets the little b_glyph monogram for that extra polish.
- Wires up real favicons (ico + 16/32) and apple-touch-icon + webmanifest
  so the tab and bookmarks actually look like Bongbetic.
- Vendors the missing brand bits: favicon set, apple icon, 192px icons,
  hi-res wordmark and contact sheet.

fenris.py

@@ -360,6 +360,11 @@ DASHBOARD_HTML = r"""<!doctype html>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width,initial-scale=1">
 <title>Fenris — NVMe Wear Dashboard</title>
+<link rel="icon" href="/assets/bongbetic-brand/favicon.ico" sizes="any">
+<link rel="icon" type="image/png" sizes="32x32" href="/assets/bongbetic-brand/favicon-32.png">
+<link rel="icon" type="image/png" sizes="16x16" href="/assets/bongbetic-brand/favicon-16.png">
+<link rel="apple-touch-icon" href="/assets/bongbetic-brand/apple-touch-icon.png">
+<link rel="manifest" href="/assets/bongbetic-brand/site.webmanifest">
 <script src="https://cdn.tailwindcss.com"></script>
 <script>tailwind.config={darkMode:'class'}</script>
 <style>
@@ -396,9 +401,16 @@ DASHBOARD_HTML = r"""<!doctype html>
 <header>
   <div class="container" style="display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.7rem 1rem">
     <div style="display:flex;align-items:center;gap:.75rem;min-width:0">
-      <div style="width:28px;height:28px;border-radius:6px;background:#58a6ff;display:flex;align-items:center;justify-content:center;font-weight:800;color:#0b0f14;flex-shrink:0">F</div>
+      <a href="https://bongbetic.com" target="_blank" rel="noopener" style="display:flex;align-items:center;gap:.5rem;text-decoration:none;flex-shrink:0" title="Bongbetic">
+        <img src="/assets/bongbetic-brand/icon-dark-512.png" alt="Bongbetic" style="width:32px;height:32px;border-radius:6px;object-fit:cover">
+        <picture>
+          <source srcset="/assets/bongbetic-brand/wordmark-light.png" media="(prefers-color-scheme: dark)">
+          <img src="/assets/bongbetic-brand/wordmark-dark.png" alt="Bongbetic" style="height:18px;object-fit:contain">
+        </picture>
+      </a>
+      <span style="color:var(--border);font-size:1.1rem;flex-shrink:0">·</span>
       <div style="min-width:0">
-        <div style="font-weight:800;letter-spacing:.08em;font-size:.95rem;white-space:nowrap">FENRIS <span style="font-weight:400;opacity:.7;letter-spacing:0">by Bongbetic</span></div>
+        <div style="font-weight:800;letter-spacing:.08em;font-size:.95rem;white-space:nowrap">FENRIS</div>
         <div id="devInfo" style="font-size:.72rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis">loading…</div>
       </div>
     </div>
@@ -428,7 +440,12 @@ DASHBOARD_HTML = r"""<!doctype html>
   </div>
 </main>
 
-<footer class="container">© Bongbetic — Fenris · <span id="footerMeta"></span></footer>
+<footer class="container" style="display:flex;align-items:center;justify-content:center;gap:.5rem;flex-wrap:wrap">
+  <a href="https://bongbetic.com" target="_blank" rel="noopener" style="display:inline-flex;align-items:center;gap:.35rem;text-decoration:none;color:inherit">
+    <img src="/assets/bongbetic-brand/b_glyph.svg" alt="" style="width:16px;height:16px;opacity:.7"> © Bongbetic
+  </a>
+  — Fenris · <span id="footerMeta"></span>
+</footer>
 
 <script>
 let POLL_MS = 300000;