Clean up frontend branding and metadata

Replace Vite defaults with Nuzlocke Tracker branding: custom pokeball-
skull favicon (SVG + PNG + ICO), page title, meta description, Open
Graph tags, theme-color, web manifest, and package.json name.

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

frontend/public/favicon.svg

@@ -0,0 +1,27 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64">
+  <!-- Pokeball top (red) -->
+  <path d="M32 4C16.536 4 4 16.536 4 32h56C60 16.536 47.464 4 32 4z" fill="#DC2626"/>
+  <!-- Pokeball bottom (white) -->
+  <path d="M4 32c0 15.464 12.536 28 28 28s28-12.536 28-28H4z" fill="#F5F5F5"/>
+  <!-- Center band -->
+  <rect x="4" y="29" width="56" height="6" fill="#1F2937"/>
+  <!-- Center circle (dark background for skull) -->
+  <circle cx="32" cy="32" r="12" fill="#1F2937"/>
+  <!-- Skull -->
+  <g transform="translate(32, 30)">
+    <!-- Skull cranium -->
+    <ellipse cx="0" cy="0" rx="8" ry="7.5" fill="#F5F5F5"/>
+    <!-- Left eye -->
+    <ellipse cx="-3" cy="-1" rx="2.2" ry="2.5" fill="#1F2937"/>
+    <!-- Right eye -->
+    <ellipse cx="3" cy="-1" rx="2.2" ry="2.5" fill="#1F2937"/>
+    <!-- Nose -->
+    <path d="M-0.8 3 L0.8 3 L0 4.2z" fill="#1F2937"/>
+    <!-- Teeth -->
+    <rect x="-4.5" y="5.5" width="9" height="3.5" rx="0.8" fill="#F5F5F5" stroke="#1F2937" stroke-width="0.8"/>
+    <line x1="-1.5" y1="5.5" x2="-1.5" y2="9" stroke="#1F2937" stroke-width="0.6"/>
+    <line x1="1.5" y1="5.5" x2="1.5" y2="9" stroke="#1F2937" stroke-width="0.6"/>
+  </g>
+  <!-- Outline -->
+  <circle cx="32" cy="32" r="28" fill="none" stroke="#1F2937" stroke-width="2.5"/>
+</svg>

frontend/public/site.webmanifest

@@ -0,0 +1,11 @@
+{
+  "name": "Nuzlocke Tracker",
+  "short_name": "Nuzlocke",
+  "icons": [
+    { "src": "/icon-192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "/icon-512.png", "sizes": "512x512", "type": "image/png" }
+  ],
+  "theme_color": "#DC2626",
+  "background_color": "#111827",
+  "display": "standalone"
+}

frontend/public/vite.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>