fix(rnetwork): remove linkLineDash (3D unsupported), fix three/webgpu duplication

- Remove .linkLineDash() chain call — only exists in 2D force-graph,
  not 3d-force-graph. Dashed edges were visual-only, no functional loss.
- Map three/webgpu to three.module.js instead of three.webgpu.js to
  avoid loading two full copies of Three.js.

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

modules/rnetwork/components/folk-graph-viewer.ts

@@ -594,10 +594,6 @@ class FolkGraphViewer extends HTMLElement {
 					}
 					return "#c4b5fd";
 				})
-				.linkLineDash((link: GraphEdge) => {
-					const style = EDGE_STYLES[link.type] || EDGE_STYLES.default;
-					return style.dashed ? [4, 2] : null;
-				})
 				.onNodeClick((node: GraphNode) => {
 					if (this.selectedNode?.id === node.id) {
 						this.selectedNode = null;

modules/rnetwork/mod.ts

@@ -17,7 +17,7 @@ const GRAPH3D_IMPORTMAP = `<script type="importmap">
 {
   "imports": {
     "three": "https://cdn.jsdelivr.net/npm/three@0.169.0/build/three.module.js",
-    "three/webgpu": "https://cdn.jsdelivr.net/npm/three@0.169.0/build/three.webgpu.js",
+    "three/webgpu": "https://cdn.jsdelivr.net/npm/three@0.169.0/build/three.module.js",
     "three/addons/": "https://cdn.jsdelivr.net/npm/three@0.169.0/examples/jsm/",
     "three/examples/jsm/": "https://cdn.jsdelivr.net/npm/three@0.169.0/examples/jsm/",
     "3d-force-graph": "https://esm.sh/3d-force-graph@1?bundle-deps&external=three"