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-media-element/MediaStream.js

@@ -0,0 +1,100 @@
+import * as PropertySymbol from '../../PropertySymbol.js';
+import Crypto from 'crypto';
+import EventTarget from '../../event/EventTarget.js';
+import MediaStreamTrackEvent from '../../event/events/MediaStreamTrackEvent.js';
+/**
+ * MediaStream.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/MediaStream
+ */
+export default class MediaStream extends EventTarget {
+    // Public properties
+    active = true;
+    id = Crypto.randomUUID();
+    // Events
+    onaddtrack = null;
+    onremovetrack = null;
+    // Internal properties
+    [PropertySymbol.tracks] = [];
+    /**
+     * Constructor.
+     *
+     * @param [streamOrTracks] Stream or tracks.
+     */
+    constructor(streamOrTracks) {
+        super();
+        if (!this[PropertySymbol.window]) {
+            throw new TypeError(`Failed to construct '${this.constructor.name}': '${this.constructor.name}' was constructed outside a Window context.`);
+        }
+        if (streamOrTracks !== undefined) {
+            this[PropertySymbol.tracks] =
+                streamOrTracks instanceof MediaStream
+                    ? streamOrTracks[PropertySymbol.tracks].slice()
+                    : streamOrTracks;
+        }
+    }
+    /**
+     * Adds a track.
+     *
+     * @param track Track.
+     */
+    addTrack(track) {
+        if (this[PropertySymbol.tracks].includes(track)) {
+            return;
+        }
+        this[PropertySymbol.tracks].push(track);
+        this.dispatchEvent(new MediaStreamTrackEvent('addtrack', { track }));
+    }
+    /**
+     * Returns a clone.
+     *
+     * @returns Clone.
+     */
+    clone() {
+        return new this.constructor(this);
+    }
+    /**
+     * Returns audio tracks.
+     *
+     * @returns Audio tracks.
+     */
+    getAudioTracks() {
+        return this[PropertySymbol.tracks].filter((track) => track.kind === 'audio');
+    }
+    /**
+     * Returns track by id.
+     *
+     * @param id Id.
+     * @returns Track.
+     */
+    getTrackById(id) {
+        for (const track of this[PropertySymbol.tracks]) {
+            if (track.id === id) {
+                return track;
+            }
+        }
+        return null;
+    }
+    /**
+     * Returns video tracks.
+     *
+     * @returns Video tracks.
+     */
+    getVideoTracks() {
+        return this[PropertySymbol.tracks].filter((track) => track.kind === 'video');
+    }
+    /**
+     * Removes a track.
+     *
+     * @param track Track.
+     */
+    removeTrack(track) {
+        const index = this[PropertySymbol.tracks].indexOf(track);
+        if (index === -1) {
+            return;
+        }
+        this[PropertySymbol.tracks].splice(index, 1);
+        this.dispatchEvent(new MediaStreamTrackEvent('removetrack', { track }));
+    }
+}
+//# sourceMappingURL=MediaStream.js.map