Nav active highlighting; reorder add battery form; export/import icons

static/style.css

@@ -116,6 +116,7 @@
     nav .brand:hover { text-decoration: none; opacity: 0.9; }
     nav a { color: #bfdbfe; font-size: 0.9rem; padding: 0.25rem 0.5rem; border-radius: 4px; white-space: nowrap; }
     nav a:hover { background: #1d4ed8; color: #fff; text-decoration: none; }
+    nav a.active { background: #1d4ed8; color: #fff; }
 
     /* Layout */
     .container { max-width: 960px; margin: 1.5rem auto; padding: 0 1rem; }
@@ -196,6 +197,7 @@
       nav { background: #0c1a3b; }
       nav a { color: #93c5fd; }
       nav a:hover { background: #1e3a8a; color: #fff; }
+      nav a.active { background: #1e3a8a; color: #fff; }
       nav .brand { color: #e2e8f0; }
 
       #bulk-toolbar    { background: var(--bg-toolbar) !important; }