feat(electron): scaffold electron-vite project structure

Initialize Wave 1 Electron integration with:
- electron v40.6.1, electron-vite v5.0.0, electron-builder v26.8.1
- Main entry point: electron/main/index.ts with app:// protocol registration
- Preload placeholder: electron/preload/index.ts for Wave 2 IPC
- electron.vite.config.ts with unified renderer chunk splitting strategy
- tsconfig.electron.json with ESNext module support
- Updated package.json with electron dependencies and scripts:
  - electron:dev, electron:build, electron:preview
- All original scripts (dev, build, test, etc) remain unchanged
- TypeScript compilation verified: tsc --noEmit passes
- Ready for Wave 2: IPC bridge and contextBridge exposure

dashboard/electron.vite.config.ts

@@ -0,0 +1,150 @@
+import { defineConfig } from 'electron-vite'
+import react from '@vitejs/plugin-react'
+import path from 'path'
+
+export default defineConfig({
+  main: {
+    entry: 'electron/main/index.ts',
+    vite: {
+      build: {
+        rollupOptions: {
+          external: ['electron'],
+        },
+      },
+      resolve: {
+        alias: {
+          '@': path.resolve(__dirname, './src'),
+        },
+      },
+    },
+  },
+  preload: {
+    entry: 'electron/preload/index.ts',
+    vite: {
+      build: {
+        rollupOptions: {
+          external: ['electron'],
+        },
+      },
+    },
+  },
+  renderer: {
+    resolve: {
+      alias: {
+        '@': path.resolve(__dirname, './src'),
+      },
+    },
+    plugins: [react()],
+    server: {
+      port: 7999,
+      proxy: {
+        '/api': {
+          target: 'http://127.0.0.1:8001',
+          changeOrigin: true,
+          ws: true,
+          cookieDomainRewrite: '',
+          cookiePathRewrite: '/',
+        },
+      },
+    },
+    build: {
+      rollupOptions: {
+        output: {
+          manualChunks: {
+            // React core
+            'react-vendor': ['react', 'react-dom', 'react/jsx-runtime'],
+
+            // TanStack Router
+            router: ['@tanstack/react-router', '@tanstack/react-virtual'],
+
+            // Radix UI core
+            'radix-core': [
+              '@radix-ui/react-dialog',
+              '@radix-ui/react-select',
+              '@radix-ui/react-checkbox',
+              '@radix-ui/react-label',
+              '@radix-ui/react-slot',
+              '@radix-ui/react-toast',
+              '@radix-ui/react-tooltip',
+            ],
+
+            // Radix UI extras
+            'radix-extra': [
+              '@radix-ui/react-alert-dialog',
+              '@radix-ui/react-avatar',
+              '@radix-ui/react-collapsible',
+              '@radix-ui/react-context-menu',
+              '@radix-ui/react-popover',
+              '@radix-ui/react-progress',
+              '@radix-ui/react-scroll-area',
+              '@radix-ui/react-separator',
+              '@radix-ui/react-slider',
+              '@radix-ui/react-switch',
+              '@radix-ui/react-tabs',
+            ],
+
+            // Icons
+            icons: ['lucide-react'],
+
+            // Charts
+            charts: ['recharts'],
+
+            // CodeMirror
+            codemirror: [
+              '@uiw/react-codemirror',
+              '@codemirror/lang-javascript',
+              '@codemirror/lang-json',
+              '@codemirror/lang-python',
+              '@codemirror/lint',
+              '@codemirror/theme-one-dark',
+            ],
+
+            // ReactFlow
+            reactflow: ['reactflow', 'dagre'],
+
+            // Markdown
+            markdown: [
+              'react-markdown',
+              'remark-gfm',
+              'remark-math',
+              'rehype-katex',
+              'katex',
+            ],
+
+            // Uppy
+            uppy: [
+              '@uppy/core',
+              '@uppy/dashboard',
+              '@uppy/react',
+              '@uppy/xhr-upload',
+            ],
+
+            // Drag and drop
+            dnd: [
+              '@dnd-kit/core',
+              '@dnd-kit/sortable',
+              '@dnd-kit/utilities',
+            ],
+
+            // Utils
+            utils: [
+              'date-fns',
+              'clsx',
+              'tailwind-merge',
+              'class-variance-authority',
+              'axios',
+            ],
+
+            // Misc
+            misc: [
+              'react-joyride',
+              'react-day-picker',
+              'cmdk',
+            ],
+          },
+        },
+      },
+      chunkSizeWarningLimit: 500,
+    },
+  },
+})