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/base64/Base64.d.ts

@@ -0,0 +1,24 @@
+/**
+ * Base64 encoding and decoding.
+ */
+export default class Base64 {
+    /**
+     * Creates a Base64-encoded ASCII string from a binary string (i.e., a string in which each character in the string is treated as a byte of binary data).
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/API/btoa
+     * @param data Binay data.
+     * @returns Base64-encoded string.
+     */
+    static btoa(data: unknown): string;
+    /**
+     * Decodes a string of data which has been encoded using Base64 encoding.
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/API/atob
+     * @see https://infra.spec.whatwg.org/#forgiving-base64-encode.
+     * @see Https://html.spec.whatwg.org/multipage/webappapis.html#btoa.
+     * @param data Binay string.
+     * @returns An ASCII string containing decoded data from encodedData.
+     */
+    static atob(data: unknown): string;
+}
+//# sourceMappingURL=Base64.d.ts.map

frontend/node_modules/happy-dom/lib/base64/Base64.d.ts.map

@@ -0,0 +1 @@
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frontend/node_modules/happy-dom/lib/base64/Base64.js

@@ -0,0 +1,83 @@
+import DOMException from '../exception/DOMException.js';
+import DOMExceptionNameEnum from '../exception/DOMExceptionNameEnum.js';
+const BASE64_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
+/**
+ * Base64 encoding and decoding.
+ */
+export default class Base64 {
+    /**
+     * Creates a Base64-encoded ASCII string from a binary string (i.e., a string in which each character in the string is treated as a byte of binary data).
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/API/btoa
+     * @param data Binay data.
+     * @returns Base64-encoded string.
+     */
+    static btoa(data) {
+        const str = data.toString();
+        if (/[^\u0000-\u00ff]/.test(str)) {
+            throw new DOMException("Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.", DOMExceptionNameEnum.invalidCharacterError);
+        }
+        let t = '';
+        let p = -6;
+        let a = 0;
+        let i = 0;
+        let v = 0;
+        let c;
+        while (i < str.length || p > -6) {
+            if (p < 0) {
+                if (i < str.length) {
+                    c = str.charCodeAt(i++);
+                    v += 8;
+                }
+                else {
+                    c = 0;
+                }
+                a = ((a & 255) << 8) | (c & 255);
+                p += 8;
+            }
+            t += BASE64_CHARS.charAt(v > 0 ? (a >> p) & 63 : 64);
+            p -= 6;
+            v -= 6;
+        }
+        return t;
+    }
+    /**
+     * Decodes a string of data which has been encoded using Base64 encoding.
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/API/atob
+     * @see https://infra.spec.whatwg.org/#forgiving-base64-encode.
+     * @see Https://html.spec.whatwg.org/multipage/webappapis.html#btoa.
+     * @param data Binay string.
+     * @returns An ASCII string containing decoded data from encodedData.
+     */
+    static atob(data) {
+        const str = data.toString();
+        if (/[^\u0000-\u00ff]/.test(str)) {
+            throw new DOMException("Failed to execute 'atob' on 'Window': The string to be decoded contains characters outside of the Latin1 range.", DOMExceptionNameEnum.invalidCharacterError);
+        }
+        if (/[^A-Za-z\d+/=]/.test(str) || str.length % 4 == 1) {
+            throw new DOMException("Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.", DOMExceptionNameEnum.invalidCharacterError);
+        }
+        let t = '';
+        let p = -8;
+        let a = 0;
+        let c;
+        let d;
+        for (let i = 0; i < str.length; i++) {
+            if ((c = BASE64_CHARS.indexOf(str.charAt(i))) < 0) {
+                continue;
+            }
+            a = (a << 6) | (c & 63);
+            if ((p += 6) >= 0) {
+                d = (a >> p) & 255;
+                if (c !== 64) {
+                    t += String.fromCharCode(d);
+                }
+                a &= 63;
+                p -= 8;
+            }
+        }
+        return t;
+    }
+}
+//# sourceMappingURL=Base64.js.map

frontend/node_modules/happy-dom/lib/base64/Base64.js.map

@@ -0,0 +1 @@
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