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

docs/dashboard-guide.md

@@ -171,6 +171,10 @@ Project-wide routing defaults are configured in **Settings → Node Routing**.
 
 The Node Dashboard provides a mesh view of connected Fusion nodes. Each node can be a local instance or a remote headless node (`fn serve`).
 
+Navigation:
+- Desktop: Header node controls / overflow entry
+- Mobile: `MobileNavBar` → **More** sheet → **Nodes** (shown only when `experimentalFeatures.nodesView` is enabled)
+
 ![Nodes view](./screenshots/nodes-view.png)
 
 ### Local/Remote Node Switching

packages/dashboard/app/App.tsx

@@ -1046,6 +1046,7 @@ function AppInner() {
         onOpenActivityLog={modalManager.openActivityLog}
         onOpenSystemStats={modalManager.openSystemStats}
         onOpenMailbox={() => handleTaskViewChange("mailbox")}
+        onOpenNodes={handleOpenNodes}
         mailboxUnreadCount={mailboxUnreadCount}
         onOpenGitManager={modalManager.openGitManager}
         onOpenWorkflowSteps={modalManager.openWorkflowSteps}
@@ -1072,6 +1073,7 @@ function AppInner() {
           devServerView: devServerEnabled,
           todoView: todosEnabled,
           researchView: researchEnabled,
+          nodesView: nodesEnabled,
         }}
         pluginDashboardViews={pluginDashboardViews}
       />

packages/dashboard/app/__tests__/mobile-feature-access-regression.test.tsx

@@ -46,6 +46,7 @@ const createDefaultMobileNavProps = () => ({
   onOpenSettings: vi.fn(),
   onOpenActivityLog: vi.fn(),
   onOpenMailbox: vi.fn(),
+  onOpenNodes: vi.fn(),
   mailboxUnreadCount: 0,
   onOpenGitManager: vi.fn(),
   onOpenWorkflowSteps: vi.fn(),
@@ -159,9 +160,22 @@ describe("Mobile Feature Access Regression Guard", () => {
     expect(screen.getByTestId("mobile-more-item-github")).toBeDefined();
     expect(screen.getByTestId("mobile-more-item-usage")).toBeDefined();
     expect(screen.queryByTestId("mobile-more-item-chat")).toBeNull();
+    expect(screen.queryByTestId("mobile-more-item-nodes")).toBeNull();
     expect(screen.getByTestId("mobile-more-item-settings")).toBeDefined();
   });
 
+  it("nodes view is reachable from mobile More sheet when enabled", () => {
+    const props = createDefaultMobileNavProps();
+    render(<MobileNavBar {...props} experimentalFeatures={{ nodesView: true }} />);
+
+    fireEvent.click(screen.getByTestId("mobile-nav-tab-more"));
+
+    const nodesItem = screen.getByTestId("mobile-more-item-nodes");
+    expect(nodesItem).toBeDefined();
+    fireEvent.click(nodesItem);
+    expect(props.onOpenNodes).toHaveBeenCalledOnce();
+  });
+
   it("chat is accessible via the bottom nav while remaining absent from the More sheet", () => {
     const props = createDefaultMobileNavProps();
     render(<MobileNavBar {...props} view="board" />);

packages/dashboard/app/components/MobileNavBar.tsx

@@ -21,6 +21,7 @@ import {
   Play,
   Settings,
   Monitor,
+  Network,
   Search,
   Sparkles,
   Target,
@@ -72,7 +73,17 @@ export interface MobileNavBarProps {
   /** Whether to show the skills tab */
   showSkillsTab?: boolean;
   /** Experimental feature flags controlling visibility of nav items. */
-  experimentalFeatures?: { insights?: boolean; roadmap?: boolean; memoryView?: boolean; devServer?: boolean; devServerView?: boolean; todoView?: boolean; researchView?: boolean };
+  experimentalFeatures?: {
+    insights?: boolean;
+    roadmap?: boolean;
+    memoryView?: boolean;
+    devServer?: boolean;
+    devServerView?: boolean;
+    todoView?: boolean;
+    researchView?: boolean;
+    nodesView?: boolean;
+  };
+  onOpenNodes?: () => void;
   pluginDashboardViews?: PluginDashboardViewEntry[];
 }
 
@@ -123,6 +134,7 @@ export function MobileNavBar({
   onViewAllProjects,
   showSkillsTab,
   experimentalFeatures,
+  onOpenNodes,
   pluginDashboardViews = [],
 }: MobileNavBarProps) {
   const mode = useViewportMode();
@@ -657,6 +669,18 @@ export function MobileNavBar({
               </button>
             )}
 
+            {experimentalFeatures?.nodesView && onOpenNodes && (
+              <button
+                type="button"
+                className="mobile-more-item"
+                data-testid="mobile-more-item-nodes"
+                onClick={() => handleMoreAction(onOpenNodes)}
+              >
+                <Network />
+                <span>Nodes</span>
+              </button>
+            )}
+
             {todoViewEnabled && (
               <button
                 type="button"

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"));