feat(FN-3626): migrate plugin storage to project-scoped storage

Migrated the dependency-graph plugin's storage layer to use the project's scoped storage API (`projectStorage`) and added canonical storage-key assertions. The ChatView.tsx utility reference was updated to match the new storage path.

Fusion-Task-Id: FN-3626

plugins/fusion-plugin-dependency-graph/tsconfig.json

@@ -2,7 +2,7 @@
   "extends": "../tsconfig.base.json",
   "compilerOptions": {
     "outDir": "dist",
-    "rootDir": "src",
+    "rootDir": "../..",
     "jsx": "react-jsx",
     "module": "esnext",
     "moduleResolution": "bundler",