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-legend-element/HTMLLegendElement.d.ts

@@ -0,0 +1,16 @@
+import HTMLElement from '../html-element/HTMLElement.js';
+import HTMLFormElement from '../html-form-element/HTMLFormElement.js';
+/**
+ * HTMLLegendElement
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLLegendElement
+ */
+export default class HTMLLegendElement extends HTMLElement {
+    /**
+     * Returns the parent form element.
+     *
+     * @returns Form.
+     */
+    get form(): HTMLFormElement;
+}
+//# sourceMappingURL=HTMLLegendElement.d.ts.map

frontend/node_modules/happy-dom/lib/nodes/html-legend-element/HTMLLegendElement.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"HTMLLegendElement.d.ts","sourceRoot":"","sources":["../../../src/nodes/html-legend-element/HTMLLegendElement.ts"],"names":[],"mappings":"AAAA,OAAO,WAAW,MAAM,gCAAgC,CAAC;AACzD,OAAO,eAAe,MAAM,yCAAyC,CAAC;AAItE;;;;GAIG;AACH,MAAM,CAAC,OAAO,OAAO,iBAAkB,SAAQ,WAAW;IACzD;;;;OAIG;IACH,IAAW,IAAI,IAAI,eAAe,CASjC;CACD"}

frontend/node_modules/happy-dom/lib/nodes/html-legend-element/HTMLLegendElement.js

@@ -0,0 +1,25 @@
+import HTMLElement from '../html-element/HTMLElement.js';
+import HTMLFieldSetElement from '../html-field-set-element/HTMLFieldSetElement.js';
+/**
+ * HTMLLegendElement
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLLegendElement
+ */
+export default class HTMLLegendElement extends HTMLElement {
+    /**
+     * Returns the parent form element.
+     *
+     * @returns Form.
+     */
+    get form() {
+        let parent = this;
+        while (parent) {
+            if (parent instanceof HTMLFieldSetElement) {
+                return parent.form;
+            }
+            parent = parent.parentNode;
+        }
+        return null;
+    }
+}
+//# sourceMappingURL=HTMLLegendElement.js.map

frontend/node_modules/happy-dom/lib/nodes/html-legend-element/HTMLLegendElement.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"HTMLLegendElement.js","sourceRoot":"","sources":["../../../src/nodes/html-legend-element/HTMLLegendElement.ts"],"names":[],"mappings":"AAAA,OAAO,WAAW,MAAM,gCAAgC,CAAC;AAEzD,OAAO,mBAAmB,MAAM,kDAAkD,CAAC;AAGnF;;;;GAIG;AACH,MAAM,CAAC,OAAO,OAAO,iBAAkB,SAAQ,WAAW;IACzD;;;;OAIG;IACH,IAAW,IAAI;QACd,IAAI,MAAM,GAAgB,IAAI,CAAC;QAC/B,OAAO,MAAM,EAAE,CAAC;YACf,IAAI,MAAM,YAAY,mBAAmB,EAAE,CAAC;gBAC3C,OAAO,MAAM,CAAC,IAAI,CAAC;YACpB,CAAC;YACD,MAAM,GAAG,MAAM,CAAC,UAAU,CAAC;QAC5B,CAAC;QACD,OAAO,IAAI,CAAC;IACb,CAAC;CACD"}