feat: add Enhanced Graph visualization plugin with D3.js force-directed layout

Implements a new internal Yasr plugin for interactive RDF graph visualization with the following features:

- D3.js v7 force-directed graph with physics simulation
- Interactive controls: zoom, pan, drag nodes with sticky behavior
- Draggable control panel with physics parameters and filtering
- Node grouping by rdf:type with automatic color coding
- Predicate display: toggle between FontAwesome icons and CURIE labels
- Tooltip system: toggle between full IRIs and compact CURIEs
- Faceted filtering by node groups with visual legend
- Real-time physics parameter adjustment (charge strength, link distance)
- Theme support (light/dark) with automatic switching
- JSON-LD metadata injection and SVG download functionality
- Configuration persistence via localStorage
- Responsive design with mobile support

Plugin registered at priority 11 to auto-select for CONSTRUCT/DESCRIBE queries.
All preferences (panel position, visibility, display modes) persist across sessions.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: 2 people

package-lock.json

@@ -41,6 +41,7 @@
   },
   "devDependencies": {
     "@types/codemirror": "0.0.100",
+    "@types/d3": "^7.4.0",
     "@types/jquery": "^3.5.32",
     "@types/lodash-es": "^4.17.3",
     "@types/n3": "^1.1.5",

packages/yasr/package.json

@@ -676,10 +676,12 @@ export function registerPlugin(name: string, plugin: typeof Plugin, enable = tru
 import * as YasrPluginBoolean from "./plugins/boolean";
 import * as YasrPluginResponse from "./plugins/response";
 import * as YasrPluginError from "./plugins/error";
+import * as YasrPluginEnhancedGraph from "./plugins/enhanced-graph";
 
 Yasr.registerPlugin("boolean", YasrPluginBoolean.default as any);
 Yasr.registerPlugin("response", YasrPluginResponse.default as any);
 Yasr.registerPlugin("error", YasrPluginError.default as any);
+Yasr.registerPlugin("enhanced-graph", YasrPluginEnhancedGraph.default as any);
 
 export type { Plugin, DownloadInfo } from "./plugins";