feat(branding): use goat logo in header on all pages

The home page header already used ulicraft-logo-mini.svg; apply the same
brand mark to the register, account, and fjord page headers (and footers),
replacing the leftover Creeper pixel-art.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

landing/src/pages/[...lang]/fjord.astro

@@ -10,7 +10,6 @@ import {
   LANG_ACCOUNT_PATH,
   type Lang,
 } from "../../i18n/ui";
-import Creeper from "../../components/Creeper.astro";
 import CopyChip from "../../components/CopyChip.astro";
 import "../../styles/main.css";
 
@@ -56,7 +55,7 @@ const fjordPack = site.launcherManifest.fjordPack;
     <header class="nav">
       <div class="wrap nav-in">
         <a class="brand" href={homePath}>
-          <Creeper />
+          <img class="brand-logo" src="/ulicraft-logo-mini.svg" alt="" width="34" height="34" />
           <span class="name">ULICRAFT</span>
         </a>
         <nav class="nav-links">
@@ -162,7 +161,7 @@ const fjordPack = site.launcherManifest.fjordPack;
     <footer class="footer">
       <div class="wrap footer-in">
         <a class="brand" href={homePath}>
-          <Creeper />
+          <img class="brand-logo" src="/ulicraft-logo-mini.svg" alt="" width="34" height="34" />
           <span class="name">ULICRAFT</span>
         </a>
         <div class="footer-links">