[FIX] website, *: fix elements position in fullscreen or/and edit mode

* = website_livechat

Before this commit, some elements (e.g. sidebar, livechat button) were
not correctly positioned in edit mode or/and full screen mode.

task-2677132

X-original-commit: 42db4d432d39a8db87c66cd682064ab76fd0aa27
Part-of: odoo/odoo#81151

addons/website/static/src/scss/website.scss

@@ -1023,7 +1023,7 @@ header {
                 }
             }
 
-            .o_connected_user:not(.editor_has_snippets) header & {
+            .o_connected_user:not(.editor_has_snippets):not(.o_fullscreen) header & {
                 // TODO this has to be reviewed
                 $-header-template: o-website-value('header-template');
                 @if not index(('Contact', 'boxed', 'magazine'), $-header-template) {
@@ -1133,7 +1133,7 @@ header {
                 }
             }
         }
-        body.o_connected_user {
+        body.o_connected_user:not(.o_fullscreen) {
             &:not(.editor_has_snippets) #wrapwrap > header {
                 top: $o-navbar-height;
             }

addons/website_livechat/static/src/legacy/public_livechat.scss

@@ -1,4 +1,4 @@
-.editor_has_snippets {
+.editor_has_snippets:not(.o_fullscreen) {
     .o_livechat_button, .o_thread_window {
         // TODO add this in an edit-mode only file in master (in 14.0 that asset
         // would be website.assets_wysiwyg...)
@@ -6,6 +6,14 @@
     }
 }
 
+@if o-website-value('header-template') == 'sidebar' and $-hamburger-right {
+    @include media-breakpoint-up(lg) {
+        .o_livechat_button, .o_thread_window {
+            transform: translate(- o-website-value('sidebar-width'));
+        }
+    }
+}
+
 .o_website_livechat_button {
     display: flex;
     justify-content: center;