feat(brand): use real AnHonestHost wordmark + chevron logo

- Pulled the real inline SVG from anhonesthost.com (chevrons + wordmark
  with 'Host' in teal #00d4aa)
- Override Starlight's SiteTitle component so the SVG is inlined rather
  than loaded as <img>, letting currentColor follow the active theme
- Hub page header uses the same wordmark
- 'Knowledge Base' label sits to the right of the brand mark, hidden on
  narrow viewports

src/components/SiteTitle.astro

@@ -0,0 +1,49 @@
+---
+const { siteTitleHref } = Astro.locals.starlightRoute;
+---
+
+<a href={siteTitleHref} class="site-title sl-flex" translate="no" aria-label="AnHonestHost Knowledge Base">
+  <svg
+    class="brand-logo"
+    xmlns="http://www.w3.org/2000/svg"
+    viewBox="0 0 240 32"
+    fill="none"
+    height="28"
+    role="img"
+    aria-hidden="true"
+  >
+    <path d="M12 4L3 16L12 28" stroke="#00d4aa" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
+    <path d="M24 4L33 16L24 28" stroke="#00d4aa" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
+    <line x1="12" y1="16" x2="24" y2="16" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" opacity="0.35"/>
+    <text x="44" y="21" font-family="Inter, system-ui, -apple-system, sans-serif" font-size="18" font-weight="800" fill="currentColor" letter-spacing="-0.5">AnHonest<tspan fill="#00d4aa">Host</tspan></text>
+  </svg>
+  <span class="kb-label">Knowledge Base</span>
+</a>
+
+<style>
+  .site-title {
+    align-items: center;
+    gap: 0.75rem;
+    text-decoration: none;
+    white-space: nowrap;
+    min-width: 0;
+    color: var(--sl-color-text);
+  }
+  .brand-logo {
+    height: calc(var(--sl-nav-height) - 2 * var(--sl-nav-pad-y));
+    width: auto;
+  }
+  .kb-label {
+    font-size: 0.875rem;
+    font-weight: 500;
+    color: var(--anhh-text-secondary, #94a3b8);
+    padding-left: 0.75rem;
+    border-left: 1px solid var(--anhh-border-color, #334155);
+    line-height: 1;
+  }
+  @media (max-width: 50em) {
+    .kb-label {
+      display: none;
+    }
+  }
+</style>