chore: minify background image (#933)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/src/lib/components/form/profile-picture-settings.svelte

@@ -81,7 +81,7 @@
 			<FileInput
 				id="profile-picture-input"
 				variant="secondary"
-				accept="image/png, image/jpeg"
+				accept="image/png, image/jpeg, image/webp, image/avif, image/heic"
 				onchange={onImageChange}
 			>
 				<div class="group relative size-24 rounded-full">

frontend/src/routes/settings/admin/application-configuration/application-image.svelte

@@ -11,7 +11,7 @@
 		label,
 		image = $bindable(),
 		imageURL,
-		accept = 'image/png, image/jpeg, image/svg+xml, image/gif',
+		accept = 'image/png, image/jpeg, image/svg+xml, image/gif, image/webp, image/avif, image/heic',
 		forceColorScheme,
 		...restProps
 	}: HTMLAttributes<HTMLDivElement> & {

frontend/src/routes/settings/admin/oidc-clients/oidc-client-form.svelte

@@ -187,7 +187,7 @@
 				<FileInput
 					id="logo"
 					variant="secondary"
-					accept="image/png, image/jpeg, image/svg+xml"
+					accept="image/png, image/jpeg, image/svg+xml, image/webp, image/avif, image/heic"
 					onchange={onLogoChange}
 				>
 					<Button variant="secondary">