feat(wallet): QR scan modal — camera + animated QR, wired into Home/Send/Receive

New WalletScanModal scans QR codes with the device camera (BarcodeDetector
with jsQR fallback) including animated/multi-frame QRs via qrloop, then
routes what it saw: BOLT11 invoices -> lightning pay (amount locked from
the invoice when present), bitcoin:/BIP21 URIs -> on-chain send, Cashu
tokens -> redeem, Fedimint invites -> join. Entry points: camera button on
the wallet card (far right), and a Scan button centered between the
Close/Send and Close/Receive buttons of both modals.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/package.json

@@ -26,13 +26,16 @@
   "dependencies": {
     "@types/dompurify": "^3.0.5",
     "@vue-leaflet/vue-leaflet": "^0.10.1",
+    "buffer": "^6.0.3",
     "d3": "^7.9.0",
     "dompurify": "^3.3.3",
     "fast-json-patch": "^3.1.1",
     "fuse.js": "^7.1.0",
     "leaflet": "^1.9.4",
     "pinia": "^3.0.4",
+    "qr-scanner": "^1.4.2",
     "qrcode": "^1.5.4",
+    "qrloop": "^1.4.1",
     "vue": "^3.5.24",
     "vue-i18n": "^11.3.0",
     "vue-router": "^4.6.3"