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/src/__tests__/storage.test.ts

@@ -20,12 +20,22 @@ describe("storage", () => {
     localStorage.clear();
   });
 
-  it("builds project-scoped key", () => {
-    expect(projectScopedKey("proj_123")).toBe("kb:proj_123:dependency-graph-positions");
+  it("builds project-scoped key with canonical base key", () => {
+    expect(projectScopedKey("proj_123")).toBe("kb:proj_123:fusion-plugin-dependency-graph:positions");
+  });
+
+  it("falls back to unscoped key when projectId is missing or empty", () => {
+    expect(projectScopedKey()).toBe("fusion-plugin-dependency-graph:positions");
+    expect(projectScopedKey("")).toBe("fusion-plugin-dependency-graph:positions");
   });
 
   it("persists and restores positions", () => {
     savePositions("proj_123", { "FN-1": { x: 10, y: 20 } });
     expect(loadPositions("proj_123")).toEqual({ "FN-1": { x: 10, y: 20 } });
   });
+
+  it("returns empty object for invalid JSON", () => {
+    localStorage.setItem("kb:proj_123:fusion-plugin-dependency-graph:positions", "not-json");
+    expect(loadPositions("proj_123")).toEqual({});
+  });
 });

plugins/fusion-plugin-dependency-graph/src/storage.ts

@@ -1,14 +1,14 @@
-const BASE_KEY = "dependency-graph-positions";
+import { getScopedItem, scopedKey, setScopedItem } from "../../../packages/dashboard/app/utils/projectStorage";
+
+const BASE_KEY = "fusion-plugin-dependency-graph:positions";
 
 export function projectScopedKey(projectId?: string): string {
-  const suffix = projectId ?? "default";
-  return `kb:${suffix}:${BASE_KEY}`;
+  return scopedKey(BASE_KEY, projectId);
 }
 
 export function loadPositions(projectId?: string): Record<string, { x: number; y: number }> {
-  if (typeof window === "undefined") return {};
   try {
-    const raw = window.localStorage.getItem(projectScopedKey(projectId));
+    const raw = getScopedItem(BASE_KEY, projectId);
     if (!raw) return {};
     const parsed = JSON.parse(raw) as Record<string, { x: number; y: number }>;
     return parsed ?? {};
@@ -18,6 +18,5 @@ export function loadPositions(projectId?: string): Record<string, { x: number; y
 }
 
 export function savePositions(projectId: string | undefined, positions: Record<string, { x: number; y: number }>): void {
-  if (typeof window === "undefined") return;
-  window.localStorage.setItem(projectScopedKey(projectId), JSON.stringify(positions));
+  setScopedItem(BASE_KEY, JSON.stringify(positions), projectId);
 }