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-option-element/HTMLOptionElement.d.ts

@@ -0,0 +1,93 @@
+import * as PropertySymbol from '../../PropertySymbol.js';
+import Attr from '../attr/Attr.js';
+import HTMLElement from '../html-element/HTMLElement.js';
+import HTMLFormElement from '../html-form-element/HTMLFormElement.js';
+import HTMLSelectElement from '../html-select-element/HTMLSelectElement.js';
+/**
+ * HTML Option Element.
+ *
+ * Reference:
+ * https://developer.mozilla.org/en-US/docs/Web/API/HTMLOptionElement.
+ */
+export default class HTMLOptionElement extends HTMLElement {
+    [PropertySymbol.selectedness]: boolean;
+    [PropertySymbol.dirtyness]: boolean;
+    [PropertySymbol.selectNode]: HTMLSelectElement | null;
+    /**
+     * Returns inner text, which is the rendered appearance of text.
+     *
+     * @returns Inner text.
+     */
+    get text(): string;
+    /**
+     * Sets the inner text, which is the rendered appearance of text.
+     *
+     * @param innerText Inner text.
+     */
+    set text(text: string);
+    /**
+     * Returns index.
+     *
+     * @returns Index.
+     */
+    get index(): number;
+    /**
+     * Returns the parent form element.
+     *
+     * @returns Form.
+     */
+    get form(): HTMLFormElement;
+    /**
+     * Returns selected.
+     *
+     * @returns Selected.
+     */
+    get selected(): boolean;
+    /**
+     * Sets selected.
+     *
+     * @param selected Selected.
+     */
+    set selected(selected: boolean);
+    /**
+     * Returns disabled.
+     *
+     * @returns Disabled.
+     */
+    get disabled(): boolean;
+    /**
+     * Sets disabled.
+     *
+     * @param disabled Disabled.
+     */
+    set disabled(disabled: boolean);
+    /**
+     * Returns value.
+     *
+     * @returns Value.
+     */
+    get value(): string;
+    /**
+     * Sets value.
+     *
+     * @param value Value.
+     */
+    set value(value: string);
+    /**
+     * @override
+     */
+    [PropertySymbol.onSetAttribute](attribute: Attr, replacedAttribute: Attr | null): void;
+    /**
+     * @override
+     */
+    [PropertySymbol.onRemoveAttribute](removedAttribute: Attr): void;
+    /**
+     * @override
+     */
+    [PropertySymbol.connectedToNode](): void;
+    /**
+     * @override
+     */
+    [PropertySymbol.disconnectedFromNode](): void;
+}
+//# sourceMappingURL=HTMLOptionElement.d.ts.map