feat(wallet): Lightning gets the arrival screen; copy buttons unified

- lnd.createinvoice now returns r_hash_hex; new lnd.invoicestatus RPC
  looks the invoice up (SETTLED + amt_paid_sat). E2E-verified on this
  box: real invoice minted, status polls settled:false until paid.
- Receive modal: Lightning polls settlement every 3s and flips to the
  on-chain-style success view — straight to the green check + amount
  (no broadcast step; settlement is final). Raw bolt11 text removed:
  QR + CopyButton only. State fully reset per open/close.
- CopyButton is now the wallet's only copy affordance: the ark-address
  and ecash-token holdouts swapped in, their ad-hoc handlers deleted.

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

neode-ui/src/components/SendBitcoinModal.vue

@@ -227,7 +227,7 @@
             <canvas ref="tokenQrCanvas" class="rounded-lg bg-white p-2"></canvas>
           </div>
           <p class="text-xs font-mono text-white/80 break-all">{{ ecashToken }}</p>
-          <button @click="copyText(ecashToken)" class="mt-2 text-xs text-orange-400 hover:text-orange-300">{{ t('common.copy') }}</button>
+          <CopyButton :value="ecashToken" :label="t('common.copy')" size="sm" class="mt-2" />
         </div>
 
         <div v-if="error" class="mb-3 alert-error">{{ error }}</div>
@@ -604,10 +604,6 @@ function sendAnother() {
   error.value = ''
 }
 
-function copyText(text: string) {
-  navigator.clipboard.writeText(text).catch(() => {})
-}
-
 const tokenQrCanvas = ref<HTMLCanvasElement | null>(null)
 watch(ecashToken, async (token) => {
   if (!token) return