fix(geoportal): fullscreen route + local CSS + proper layout

- Add /geoportal to FULLSCREEN_ROUTES (overflow-hidden, no padding)
- Copy maplibre-gl.css to public/ and load from same origin (avoids CDN/CSP)
- Simplify layout: fill parent via h-full w-full (no negative margin hack)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/geoportal/components/geoportal-module.tsx

@@ -93,8 +93,7 @@ export function GeoportalModule() {
   }, []);
 
   return (
-    <div className="relative -mx-4 -mt-4 sm:-mx-6 sm:-mt-6 lg:-mx-8 lg:-mt-8"
-         style={{ height: "calc(100vh - 3.5rem)" }}>
+    <div className="relative h-full w-full">
       {/* Full-bleed map */}
       <MapViewer
         ref={mapHandleRef}