fix(geoportal): load MapLibre CSS via CDN link injection + fullscreen layout

- Static CSS import doesn't work with next/dynamic + standalone output.
  Now injects a <link> tag to unpkg CDN at module load time (bulletproof).
- Geoportal is now fullscreen: map fills entire viewport below the header,
  no duplicate title/description, negative margins bleed to edges.
- Removed page-level CSS imports (no longer needed).

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

src/app/(modules)/geoportal/page.tsx

@@ -1,26 +1,12 @@
 "use client";
 
-import "maplibre-gl/dist/maplibre-gl.css";
 import { FeatureGate } from "@/core/feature-flags";
-import { useI18n } from "@/core/i18n";
 import { GeoportalModule } from "@/modules/geoportal";
 
 export default function GeoportalPage() {
-  const { t } = useI18n();
-
   return (
     <FeatureGate flag="module.geoportal" fallback={<ModuleDisabled />}>
-      <div className="mx-auto max-w-7xl space-y-6">
-        <div>
-          <h1 className="text-2xl font-bold tracking-tight">
-            {t("geoportal.title")}
-          </h1>
-          <p className="text-muted-foreground">
-            {t("geoportal.description")}
-          </p>
-        </div>
-        <GeoportalModule />
-      </div>
+      <GeoportalModule />
     </FeatureGate>
   );
 }

src/app/(modules)/parcel-sync/page.tsx

@@ -1,6 +1,5 @@
 "use client";
 
-import "maplibre-gl/dist/maplibre-gl.css";
 import { FeatureGate } from "@/core/feature-flags";
 import { useI18n } from "@/core/i18n";
 import { ParcelSyncModule } from "@/modules/parcel-sync";