feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

frontend/node_modules/vitest/suppress-warnings.cjs

@@ -0,0 +1,21 @@
+// borrowed from tsx implementation:
+// https://github.com/esbuild-kit/tsx
+
+const ignoreWarnings = new Set([
+  '--experimental-loader is an experimental feature. This feature could change at any time',
+  'Custom ESM Loaders is an experimental feature. This feature could change at any time',
+  'Custom ESM Loaders is an experimental feature and might change at any time',
+  'VM Modules is an experimental feature and might change at any time',
+  'VM Modules is an experimental feature. This feature could change at any time',
+])
+
+const { emit } = process
+
+process.emit = function (event, warning) {
+  if (event === 'warning' && ignoreWarnings.has(warning.message)) {
+    return
+  }
+
+  // eslint-disable-next-line prefer-rest-params
+  return Reflect.apply(emit, this, arguments)
+}