Add favicon

Bold "T" mark in the shared mono-green style used by sibling projects (wisp, fullhouse).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

favicon.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <rect width="32" height="32" rx="7" fill="#080808"/>
+  <text x="16" y="23" text-anchor="middle"
+        font-family="'JetBrains Mono','Fira Code',ui-monospace,monospace"
+        font-size="19" font-weight="700" fill="#00e87a">T</text>
+</svg>

index.html

@@ -5,6 +5,7 @@
 <title>typo</title>
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <meta name="description" content="A typing test built from your own code and lore — real snippets from real repos.">
+<link rel="icon" type="image/svg+xml" href="/favicon.svg">
 <link rel="preconnect" href="https://fonts.googleapis.com" />
 <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
 <link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Inter:wght@400;500;600&display=swap" rel="stylesheet" />