feat(web): MazeNET scaffold — tokens, route, nav, stub page

decnet_web/src/components/MazeNET/MazeNET.css

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+.maze-stub {
+  height: 100%;
+  min-height: calc(100vh - var(--topbar-h));
+  margin: -28px -32px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.maze-stub-inner {
+  text-align: center;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.maze-stub-title {
+  font-size: var(--fs-page);
+  letter-spacing: var(--ls-title);
+  font-weight: 700;
+  color: var(--violet);
+  filter: drop-shadow(var(--violet-glow));
+}
+
+.maze-stub-sub {
+  font-size: var(--fs-mini);
+  letter-spacing: var(--ls-nav);
+  text-transform: uppercase;
+}

decnet_web/src/components/MazeNET/MazeNET.tsx

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+import React from 'react';
+import './MazeNET.css';
+
+const MazeNET: React.FC = () => {
+  return (
+    <div className="maze-stub bg-scangrid">
+      <div className="maze-stub-inner">
+        <div className="maze-stub-title">MAZENET</div>
+        <div className="maze-stub-sub fx-dim">coming online…</div>
+      </div>
+    </div>
+  );
+};
+
+export default MazeNET;