feat(renderer): AppShell with resizable panes, sidebar/preview toggle, persisted sizes

src/renderer/components/layout/AppShell.tsx

@@ -0,0 +1,53 @@
+import { AppHeader } from './AppHeader';
+import { TabBar } from './TabBar';
+import { Toolbar } from './Toolbar';
+import { Breadcrumb } from './Breadcrumb';
+import { StatusBar } from './StatusBar';
+import { useAppStore } from '@/stores/app-store';
+import { ResizablePanelGroup, ResizablePanel, ResizableHandle } from '@/components/ui/resizable';
+
+export function AppShell() {
+  const { sidebarVisible, previewVisible, paneSizes, setPaneSizes } = useAppStore();
+
+  return (
+    <div className="flex h-screen flex-col bg-background text-foreground">
+      <AppHeader />
+      <TabBar />
+      <Toolbar />
+      <Breadcrumb />
+      <main className="flex-1 overflow-hidden">
+        <ResizablePanelGroup
+          direction="horizontal"
+          onLayout={(sizes) => setPaneSizes({ sidebar: sizes[0], editor: sizes[1], preview: sizes[2] })}
+        >
+          {sidebarVisible && (
+            <>
+              <ResizablePanel defaultSize={paneSizes.sidebar} minSize={15} maxSize={40}>
+                <aside className="h-full border-r border-border bg-card/10 p-3 text-sm text-muted-foreground">
+                  File tree placeholder
+                </aside>
+              </ResizablePanel>
+              <ResizableHandle />
+            </>
+          )}
+          <ResizablePanel defaultSize={previewVisible ? paneSizes.editor : 100} minSize={20}>
+            <section className="h-full bg-background p-4 text-sm text-muted-foreground">
+              Editor placeholder
+            </section>
+          </ResizablePanel>
+          {previewVisible && (
+            <>
+              <ResizableHandle />
+              <ResizablePanel defaultSize={paneSizes.preview} minSize={20}>
+                <section className="h-full border-l border-border bg-card/10 p-4 text-sm text-muted-foreground">
+                  Preview placeholder
+                </section>
+              </ResizablePanel>
+            </>
+          )}
+        </ResizablePanelGroup>
+      </main>
+      <StatusBar />
+    </div>
+  );
+}

src/renderer/components/ui/resizable.tsx

@@ -7,10 +7,10 @@ import * as ResizablePrimitive from "react-resizable-panels"
 import { cn } from "@/lib/utils"
 
 const ResizablePanelGroup = React.forwardRef<
-  React.ElementRef<typeof ResizablePrimitive.PanelGroup>,
+  React.ElementRef<typeof ResizablePrimitive.Group>,
-  React.ComponentPropsWithoutRef<typeof ResizablePrimitive.PanelGroup>
+  React.ComponentPropsWithoutRef<typeof ResizablePrimitive.Group>
 >(({ className, ...props }, ref) => (
-  <ResizablePrimitive.PanelGroup
+  <ResizablePrimitive.Group
     ref={ref}
     className={cn(
       "flex h-full w-full data-[panel-group-direction=vertical]:flex-col",
@@ -19,7 +19,7 @@ const ResizablePanelGroup = React.forwardRef<
     {...props}
   />
 ))
-ResizablePanelGroup.displayName = ResizablePrimitive.PanelGroup.displayName
+ResizablePanelGroup.displayName = "ResizablePanelGroup"
 
 const ResizablePanel = React.forwardRef<
   React.ElementRef<typeof ResizablePrimitive.Panel>,
@@ -34,16 +34,16 @@ const ResizablePanel = React.forwardRef<
     {...props}
   />
 ))
-ResizablePanel.displayName = ResizablePrimitive.Panel.displayName
+ResizablePanel.displayName = "ResizablePanel"
 
 const ResizableHandle = ({
   withHandle,
   className,
   ...props
-}: React.ComponentPropsWithoutRef<typeof ResizablePrimitive.PanelResizeHandle> & {
+}: React.ComponentPropsWithoutRef<typeof ResizablePrimitive.Separator> & {
   withHandle?: boolean
 }) => (
-  <ResizablePrimitive.PanelResizeHandle
+  <ResizablePrimitive.Separator
     className={cn(
       "relative flex w-px items-center justify-center bg-border after:absolute after:inset-y-0 after:left-1/2 after:w-1 after:-translate-x-1/2 focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring focus-visible:ring-offset-1 data-[panel-group-direction=vertical]:h-px data-[panel-group-direction=vertical]:w-full data-[panel-group-direction=vertical]:after:left-0 data-[panel-group-direction=vertical]:after:h-1 data-[panel-group-direction=vertical]:after:w-full data-[panel-group-direction=vertical]:after:-translate-y-1/2 data-[panel-group-direction=vertical]:after:translate-x-0 [&[data-panel-group-direction=vertical]>div]:rotate-90",
       className
@@ -55,7 +55,7 @@ const ResizableHandle = ({
         <GripVertical className="h-2.5 w-2.5" />
       </div>
     )}
-  </ResizablePrimitive.PanelResizeHandle>
+  </ResizablePrimitive.Separator>
 )
 ResizableHandle.displayName = "ResizableHandle"
 

src/renderer/test/setup.ts

@@ -27,3 +27,9 @@ if (typeof window !== 'undefined') {
     }),
   });
 }
+
+// Mock react-resizable-panels for jsdom environment
+if (typeof window !== 'undefined') {
+  Object.defineProperty(window, 'innerWidth', { writable: true, value: 1920 });
+  Object.defineProperty(window, 'innerHeight', { writable: true, value: 1080 });
+}

tests/component/layout/AppShell.test.tsx

@@ -0,0 +1,49 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { ThemeProvider } from '@/components/theme-provider';
+import { AppShell } from '@/components/layout/AppShell';
+import { useAppStore } from '@/stores/app-store';
+
+// Mock react-resizable-panels for jsdom environment
+vi.mock('@/components/ui/resizable', () => ({
+  ResizablePanelGroup: ({ children, direction, onLayout }: any) => (
+    <div data-testid="resizable-panel-group" data-direction={direction}>
+      {children}
+    </div>
+  ),
+  ResizablePanel: ({ children, defaultSize, minSize, maxSize }: any) => (
+    <div data-testid="resizable-panel" data-size={defaultSize} data-min={minSize} data-max={maxSize}>
+      {children}
+    </div>
+  ),
+  ResizableHandle: () => <div data-testid="resizable-handle" />,
+}));
+
+describe('AppShell', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    useAppStore.setState({ sidebarVisible: true, previewVisible: true, zenMode: false });
+  });
+
+  it('renders all shell surfaces when sidebar and preview are visible', () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppShell />
+      </ThemeProvider>
+    );
+    expect(screen.getByText(/markdownconverter/i)).toBeInTheDocument();
+    expect(screen.getByText(/no files open/i)).toBeInTheDocument();
+    expect(screen.getByText(/no file selected/i)).toBeInTheDocument();
+    expect(screen.getByText(/0 words/i)).toBeInTheDocument();
+  });
+
+  it('hides sidebar when sidebarVisible is false', () => {
+    useAppStore.setState({ sidebarVisible: false });
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppShell />
+      </ThemeProvider>
+    );
+    expect(screen.queryByText(/file tree placeholder/i)).not.toBeInTheDocument();
+  });
+});