feat(external): add dedicated ExternalApp without NcContent and reset server.css layout

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/ExternalApp.vue

@@ -0,0 +1,40 @@
+<!--
+  - SPDX-FileCopyrightText: 2024 LibreCode coop and LibreCode contributors
+  - SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
+<template>
+	<div class="external-app">
+		<router-view />
+		<RightSidebar />
+	</div>
+</template>
+
+<script setup lang="ts">
+import { defineOptions } from 'vue'
+
+defineOptions({ name: 'LibreSignExternal' })
+
+import RightSidebar from './components/RightSidebar/RightSidebar.vue'
+</script>
+
+<style lang="scss" scoped>
+.external-app {
+	position: absolute;
+	inset: 0;
+	display: flex;
+	background-color: var(--color-main-background);
+	// On mobile, NcAppSidebar relies on NcContent to overlay content.
+	// Without it, force the sidebar to cover the viewport as a full-screen overlay.
+	@media (max-width: 512px) {
+		:deep(#app-sidebar) {
+			position: fixed;
+			inset: 0;
+			width: 100vw !important;
+			max-width: 100vw !important;
+			height: 100vh;
+			z-index: 2000;
+		}
+	}
+}
+</style>

src/assets/styles/external-page.scss

@@ -0,0 +1,15 @@
+/**
+ * SPDX-FileCopyrightText: 2026 LibreCode coop and LibreCode contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+// Override server.css layout rules that assume authenticated header layout.
+// `html body #content` beats the specificity of server.css selectors.
+html body #content {
+	position: fixed;
+	inset: 0;
+	margin: 0;
+	width: 100vw;
+	height: 100vh;
+	border-radius: 0;
+}

src/external.ts

@@ -7,8 +7,9 @@ import { createApp } from 'vue'
 import { createPinia } from 'pinia'
 import { translate as t, translatePlural as n } from '@nextcloud/l10n'
 
-import App from './App.vue'
+import App from './ExternalApp.vue'
 import router from './router/router'
+import './assets/styles/external-page.scss'
 
 if (window.OCA && !window.OCA.LibreSign) {
 	Object.assign(window.OCA, { LibreSign: {} })