feat: stamp+glitch logo animation, move keyframes outside @theme

logoStamp and pathFlicker defined at global CSS scope (outside @theme)
so they are always emitted. Logo uses sharp stamp+bounce entrance with
flickering path reveals.

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

app/globals.css

@@ -84,6 +84,27 @@
     from { transform: scale(0.95); opacity: 0; }
     to { transform: scale(1); opacity: 1; }
   }
+
+}
+
+@keyframes logoStamp {
+  0%   { opacity: 0; transform: scale(2) rotate(15deg); }
+  38%  { opacity: 1; transform: scale(0.82) rotate(-5deg); }
+  58%  { transform: scale(1.14) rotate(3deg); }
+  74%  { transform: scale(0.94) rotate(-1deg); }
+  88%  { transform: scale(1.04) rotate(0.3deg); }
+  100% { transform: scale(1) rotate(0deg); }
+}
+
+@keyframes pathFlicker {
+  0%        { opacity: 0; }
+  28%, 30%  { opacity: 0; }
+  31%, 33%  { opacity: 1; }
+  34%, 40%  { opacity: 0; }
+  41%, 44%  { opacity: 1; }
+  45%, 49%  { opacity: 0; }
+  50%       { opacity: 1; }
+  100%      { opacity: 1; }
 }
 
 :root {