feat(FN-3121): merge fusion/fn-3121

This merge lands v0.15.0, bringing a major plugin system overhaul including a new dependency graph plugin with SQLite-backed storage, Quick Chat FAB with slash-triggered skill menu, and expanded plugin dashboard views. The AgentsView tree mode was fully removed with its hook, styles, and expansion s

Fusion-Task-Id: FN-3121

packages/dashboard/app/utils/__tests__/projectStorage.test.ts

@@ -82,7 +82,6 @@ describe("projectStorage", () => {
         "kb-quick-entry-text",
         "kb-inline-create-text",
         "fn-agent-view",
-        "fn-agent-tree-expanded",
         "kb-terminal-tabs",
         "kb-planning-last-description",
         "kb-subtask-last-description",
@@ -93,7 +92,7 @@ describe("projectStorage", () => {
         "kb-chat-active-session",
       ]),
     );
-    expect(PROJECT_STORAGE_KEYS).toHaveLength(17);
+    expect(PROJECT_STORAGE_KEYS).toHaveLength(16);
   });
 
   it("has no overlap between global and project-scoped keys", () => {