fix: resolve Vite build warnings for mixed static/dynamic imports

- Convert all dynamic imports of main-axios.ts to static imports (10 files)
- Convert all dynamic imports of sonner to static imports (4 files)
- Add manual chunking configuration to vite.config.ts for better bundle splitting
  - react-vendor: React and React DOM
  - ui-vendor: Radix UI, lucide-react, clsx, tailwind-merge
  - monaco: Monaco Editor
  - codemirror: CodeMirror and related packages
- Increase chunkSizeWarningLimit to 1000kB

This resolves Vite warnings about mixed import strategies preventing
proper code-splitting.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

vite.config.ts

@@ -20,6 +20,17 @@ export default defineConfig({
   base: "./",
   build: {
     sourcemap: false,
+    rollupOptions: {
+      output: {
+        manualChunks: {
+          'react-vendor': ['react', 'react-dom'],
+          'ui-vendor': ['@radix-ui/react-dialog', '@radix-ui/react-dropdown-menu', '@radix-ui/react-select', '@radix-ui/react-tabs', '@radix-ui/react-switch', '@radix-ui/react-tooltip', '@radix-ui/react-scroll-area', '@radix-ui/react-separator', 'lucide-react', 'clsx', 'tailwind-merge', 'class-variance-authority'],
+          'monaco': ['monaco-editor'],
+          'codemirror': ['@uiw/react-codemirror', '@codemirror/view', '@codemirror/state', '@codemirror/language', '@codemirror/commands', '@codemirror/search', '@codemirror/autocomplete'],
+        }
+      }
+    },
+    chunkSizeWarningLimit: 1000,
   },
   server: {
     https: useHTTPS