feat: square icon buttons for up and refresh in file panes; the Терминал view is named WorkSpace

internal/server/web/static/app.css

@@ -760,3 +760,5 @@ p.mv-a { margin:0; font-size:13px; }
 /* The file pane under the corner "+" keeps its first bar clear of it,
    while the "+" is there (one tab; with the tab strip it is hidden). */
 body:not(.multi) .fpane.under-plus .fm-bar:first-child { margin-right:40px; }
+/* The bars' square buttons, as tall as the path box beside them. */
+.fm-bar > .btn.sq, .fp-sel .btn.sq { width:34px; height:34px; }