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/autoprefixer/lib/hacks/overscroll-behavior.js

@@ -0,0 +1,33 @@
+let Declaration = require('../declaration')
+
+class OverscrollBehavior extends Declaration {
+  /**
+   * Return property name by spec
+   */
+  normalize() {
+    return 'overscroll-behavior'
+  }
+
+  /**
+   * Change property name for IE
+   */
+  prefixed(prop, prefix) {
+    return prefix + 'scroll-chaining'
+  }
+
+  /**
+   * Change value for IE
+   */
+  set(decl, prefix) {
+    if (decl.value === 'auto') {
+      decl.value = 'chained'
+    } else if (decl.value === 'none' || decl.value === 'contain') {
+      decl.value = 'none'
+    }
+    return super.set(decl, prefix)
+  }
+}
+
+OverscrollBehavior.names = ['overscroll-behavior', 'scroll-chaining']
+
+module.exports = OverscrollBehavior