convert lang="typescript" to lang="ts"

see https://github.com/sveltejs/vite-plugin-svelte/blob/main/docs/faq.md#why-isnt-vite-detecting-my-imports-correctly-in-svelte-files-with-typescript

front/src/Components/EmbedScreens/CamerasContainer.svelte

@@ -1,4 +1,4 @@
-<script lang="typescript">
+<script lang="ts">
     import type { EmbedScreen } from "../../Stores/EmbedScreensStore";
     import { streamableCollectionStore } from "../../Stores/StreamableCollectionStore";
     import MediaBox from "../Video/MediaBox.svelte";

front/src/Components/EmbedScreens/CoWebsiteThumbnailSlot.svelte

@@ -1,4 +1,4 @@
-<script lang="typescript">
+<script lang="ts">
     import { onMount } from "svelte";
 
     import { ICON_URL } from "../../Enum/EnvironmentVariable";

front/src/Components/EmbedScreens/CoWebsitesContainer.svelte

@@ -1,4 +1,4 @@
-<script lang="typescript">
+<script lang="ts">
     import { coWebsites } from "../../Stores/CoWebsiteStore";
     import CoWebsiteThumbnail from "./CoWebsiteThumbnailSlot.svelte";
 

front/src/Components/EmbedScreens/EmbedScreensContainer.svelte

@@ -1,4 +1,4 @@
-<script lang="typescript">
+<script lang="ts">
     import PresentationLayout from "./Layouts/PresentationLayout.svelte";
     import MozaicLayout from "./Layouts/MozaicLayout.svelte";
     import { LayoutMode } from "../../WebRtc/LayoutManager";