feat(FN-3208): restore mobile nodes nav and improve planning mode

This merge delivers significant testing infrastructure refactoring alongside focused UI, planning, and plugin features. The largest change splits the 20K-line `routes.test.ts` monolith into 15 granular route test files (agents, auth, automation, git, github, planning, settings, system, tasks, tasks-

Fusion-Task-Id: FN-3208

packages/dashboard/app/components/__tests__/MobileNavBar.test.tsx

@@ -34,6 +34,7 @@ const createDefaultProps = () => ({
   onOpenActivityLog: vi.fn(),
   onOpenSystemStats: vi.fn(),
   onOpenMailbox: vi.fn(),
+  onOpenNodes: vi.fn(),
   mailboxUnreadCount: 0,
   onOpenGitManager: vi.fn(),
   onOpenWorkflowSteps: vi.fn(),
@@ -334,6 +335,29 @@ describe("MobileNavBar", () => {
     expect(screen.getByTestId("mobile-more-item-insights")).toBeDefined();
   });
 
+  it("shows nodes in more sheet only when nodesView is enabled", () => {
+    const disabledProps = createDefaultProps();
+    const { unmount } = render(<MobileNavBar {...disabledProps} experimentalFeatures={{}} />);
+    fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
+    expect(screen.queryByTestId("mobile-more-item-nodes")).toBeNull();
+    unmount();
+
+    const enabledProps = createDefaultProps();
+    render(<MobileNavBar {...enabledProps} experimentalFeatures={{ nodesView: true }} />);
+    fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
+    expect(screen.getByTestId("mobile-more-item-nodes")).toBeDefined();
+  });
+
+  it("invokes onOpenNodes when nodes item is tapped", () => {
+    const props = createDefaultProps();
+    render(<MobileNavBar {...props} experimentalFeatures={{ nodesView: true }} />);
+
+    fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
+    fireEvent.click(screen.getByTestId("mobile-more-item-nodes"));
+
+    expect(props.onOpenNodes).toHaveBeenCalledOnce();
+  });
+
   it("does not show memory in more sheet when memoryView is not enabled", () => {
     render(<MobileNavBar {...createDefaultProps()} experimentalFeatures={{}} />);
     fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));