feat(devices): map MACs to LAN devices; identify Orbi satellite + Galaxy Tab

ARP/nmap rescan (2026-06-08) attaches real MACs to the devices band and shows
them in the UI. Reclassifies two flagged "unknowns": .13 = Orbi mesh satellite
(BC:A5:11:.. Netgear; the uhttpd UI made it look like a rogue OpenWrt box) →
Network; .171 = Galaxy Tab S4 (randomized MAC) → Personal. Remaining flags are
.15 (ASUSTek, needs ID) and .34/.35/.51 (offline).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/views/devices_band.js

@@ -20,6 +20,7 @@ async function load() {
           el('div', { class: 'dv-tile' + (d.flag ? ' flag' : '') },
             el('span', { class: 'dv-nm' }, d.name),
             el('span', { class: 'dv-ip' }, d.ip),
+            d.mac ? el('span', { class: 'dv-mac' }, d.mac) : null,
             el('span', { class: 'dv-vendor' }, d.vendor || ''))))));
     mount(host,
       el('div', { class: 'dv-hd' },