fix(skins): keep menu links visible and align native select look

The wrapper had width:100% which pushed the right-side menu links
(mail/contacts/settings/logout) out of #taskbar in Classic, and the
global custom select styling defeated Roundcube's native select
rendering — even when reset — because any background-image on a
<select> disables the native gradient/rounded corners.

- Scope the custom appearance/SVG-chevron CSS to Elastic and Larry
- Add a Classic-specific rule (width:auto, max-width, -2px nudge) that
  preserves Roundcube's native select look in #taskbar
- Drop the inline padding:0 imposed by the PHP renderer; let CSS own it
- Cap the Larry wrapper width to keep .button-logout in flow, and move
  the Larry-only styling out of the JS into the scoped CSS rule

Fixes #1

ident_switch-switch.js

@@ -57,7 +57,7 @@ $(function() {
 });
 
 /**
- * Place switcher in Larry skin: replace username in top-right corner.
+ * Place switcher in Larry skin: replace username in top-right corner of #topline.
  */
 function plugin_switchIdent_addCbLarry($wrapper, $sw) {
 	var $topRight = $('#topline .topright');
@@ -65,11 +65,6 @@ function plugin_switchIdent_addCbLarry($wrapper, $sw) {
 		return false;
 	}
 
-	$sw.css({
-		'font-weight': 'bold',
-		'text-overflow': 'ellipsis'
-	});
-
 	$topRight.find('.username').hide();
 	$topRight.prepend($wrapper);
 	return true;