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/happy-dom/lib/nodes/html-data-element/HTMLDataElement.d.ts

@@ -0,0 +1,21 @@
+import HTMLElement from '../html-element/HTMLElement.js';
+/**
+ * HTMLDataElement
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLDataElement
+ */
+export default class HTMLDataElement extends HTMLElement {
+    /**
+     * Returns value.
+     *
+     * @returns Value.
+     */
+    get value(): string;
+    /**
+     * Sets value.
+     *
+     * @param value Value.
+     */
+    set value(value: string);
+}
+//# sourceMappingURL=HTMLDataElement.d.ts.map

frontend/node_modules/happy-dom/lib/nodes/html-data-element/HTMLDataElement.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"HTMLDataElement.d.ts","sourceRoot":"","sources":["../../../src/nodes/html-data-element/HTMLDataElement.ts"],"names":[],"mappings":"AAAA,OAAO,WAAW,MAAM,gCAAgC,CAAC;AACzD;;;;GAIG;AACH,MAAM,CAAC,OAAO,OAAO,eAAgB,SAAQ,WAAW;IACvD;;;;OAIG;IACH,IAAW,KAAK,IAAI,MAAM,CAEzB;IAED;;;;OAIG;IACH,IAAW,KAAK,CAAC,KAAK,EAAE,MAAM,EAE7B;CACD"}

frontend/node_modules/happy-dom/lib/nodes/html-data-element/HTMLDataElement.js

@@ -0,0 +1,25 @@
+import HTMLElement from '../html-element/HTMLElement.js';
+/**
+ * HTMLDataElement
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLDataElement
+ */
+export default class HTMLDataElement extends HTMLElement {
+    /**
+     * Returns value.
+     *
+     * @returns Value.
+     */
+    get value() {
+        return this.getAttribute('value') || '';
+    }
+    /**
+     * Sets value.
+     *
+     * @param value Value.
+     */
+    set value(value) {
+        this.setAttribute('value', value);
+    }
+}
+//# sourceMappingURL=HTMLDataElement.js.map

frontend/node_modules/happy-dom/lib/nodes/html-data-element/HTMLDataElement.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"HTMLDataElement.js","sourceRoot":"","sources":["../../../src/nodes/html-data-element/HTMLDataElement.ts"],"names":[],"mappings":"AAAA,OAAO,WAAW,MAAM,gCAAgC,CAAC;AACzD;;;;GAIG;AACH,MAAM,CAAC,OAAO,OAAO,eAAgB,SAAQ,WAAW;IACvD;;;;OAIG;IACH,IAAW,KAAK;QACf,OAAO,IAAI,CAAC,YAAY,CAAC,OAAO,CAAC,IAAI,EAAE,CAAC;IACzC,CAAC;IAED;;;;OAIG;IACH,IAAW,KAAK,CAAC,KAAa;QAC7B,IAAI,CAAC,YAAY,CAAC,OAAO,EAAE,KAAK,CAAC,CAAC;IACnC,CAAC;CACD"}