Keyboard shortcuts for mail and a shortcut list, offline help and refresh on return, push alerts for new mail

public/style.css

@@ -796,3 +796,4 @@ body.nav-mini .ngrp span { display: none; }
 .vhero { --vtint: transparent; }
 .vhero::before { content: ''; position: absolute; inset: -8px -16px 0 -16px; z-index: -1; background: radial-gradient(120% 90% at 20% 0, color-mix(in srgb, var(--vtint) 45%, transparent), transparent 70%); pointer-events: none; transition: background .5s; }
 .vempty { grid-column: 1 / -1; display: grid; justify-items: center; gap: 8px; padding: 36px 12px; color: var(--muted); } .vempty svg { width: 40px; height: 40px; opacity: .6; }
+kbd { display: inline-block; padding: 1px 7px; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 6px; background: var(--panel2); font: 12px ui-monospace, Menlo, monospace; }