feat(devices): Scan Now + Manual Add (IP option, MAC colon-mask) → 2.1.4

'Scan Now' triggers POST /api/devices/scan from the band header. '+ Add by MAC'
renamed '+ Manual Add' with an optional IP field (addBody/addManual accept ip)
and a MAC input that auto-inserts colons as you type. Frontend test 4/4; DB-backed
api/repo tests written (run with the suite — skipped locally to avoid colliding
with a concurrent test run on void_test).

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

CHANGELOG.md

@@ -3,6 +3,10 @@
 All notable changes to Void 2.0 are documented here.
 Format: [Keep a Changelog](https://keepachangelog.com).
 
+## 2.1.4 — Devices band: Scan Now + richer Manual Add
+- **"Scan Now" button** in the Network·Devices header — triggers the scheduled scan on demand (`POST /api/devices/scan`) and refreshes the band.
+- **"+ Add by MAC" → "+ Manual Add"**, now with an optional **IP** field (`POST /api/devices` + `lan_devices.addManual` accept `ip`), and the **MAC field auto-inserts the colons** as you type.
+
 ## 2.1.3 — Manually add a device by MAC
 - **"+ Add by MAC" in the Network·Devices band** (`POST /api/devices`, `lan_devices.addManual`, `devices_band.js`): pre-register an **offline** device by typing its MAC (+ optional name/group). Lands as `status='known'`, `present=false`; it gets enriched (IP/vendor/present) automatically the next time it's seen by the scan. Idempotent.