fix(wallet): blank send/receive on every open; sweep shows amount; camera option stays visible

Operator-reported (2026-08-05):

- Send/Receive modals reset to a blank slate on every open. Stale state —
  destination, amount, memo, and above all an armed "send all funds"
  toggle — silently carried into the next payment.
- Arming "send all funds" now shows the swept balance in the (disabled)
  amount field instead of a confusing 0; disarming or leaving the
  on-chain tab clears it.
- The scan modal no longer hides "Scan with camera" on plain-http desktop
  (browsers only allow getUserMedia on secure origins): the option stays
  visible with a one-line explanation, and choosing it surfaces the HTTPS
  requirement with photo/paste fallbacks. The companion app's native
  scanner path is untouched and still takes priority.
- What's New entry for v1.7.125-alpha.

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

neode-ui/src/components/SendBitcoinModal.vue

@@ -327,15 +327,57 @@ const isSweep = computed(() => sendMethod.value === 'onchain' && sendAll.value)
 
 function toggleSendAll() {
   sendAll.value = !sendAll.value
-  if (sendAll.value && onchainBalance.value === null) {
-    rpcClient.call<{ balance_sats: number }>({ method: 'lnd.getinfo', timeout: 5000 })
-      .then((res) => { onchainBalance.value = res.balance_sats || 0 })
-      .catch(() => { /* balance hint is best-effort */ })
+  if (!sendAll.value) {
+    // Disarming clears the field — a swept-balance figure left behind reads
+    // as a typed amount.
+    amount.value = 0
+    return
   }
+  // Arming shows the swept balance IN the (disabled) amount field — a field
+  // stuck at 0 while "send all" is lit read as "sending nothing" (operator
+  // feedback 2026-08-05). Refresh the figure on every arm.
+  const applyBalance = () => {
+    if (sendAll.value && onchainBalance.value !== null) amount.value = onchainBalance.value
+  }
+  applyBalance()
+  rpcClient.call<{ balance_sats: number }>({ method: 'lnd.getinfo', timeout: 5000 })
+    .then((res) => { onchainBalance.value = res.balance_sats || 0; applyBalance() })
+    .catch(() => { /* balance hint is best-effort */ })
 }
 
 // Leaving the on-chain tab disarms the sweep so it can never apply elsewhere
-watch(sendMethod, (m) => { if (m !== 'onchain') sendAll.value = false })
+// (and drops the swept-balance figure it wrote into the amount field).
+watch(sendMethod, (m) => {
+  if (m !== 'onchain' && sendAll.value) {
+    sendAll.value = false
+    amount.value = 0
+  }
+})
+
+// Every open starts from a blank slate. Stale state from the previous send —
+// destination, amount, and above all an armed "send all funds" toggle — is
+// dangerous to inherit invisibly (operator feedback 2026-08-05).
+watch(() => props.show, (shown) => {
+  if (!shown) return
+  sendMethod.value = 'lightning'
+  amountUnit.value = 'sats'
+  amountEntry.value = 0
+  dest.value = ''
+  error.value = ''
+  successInfo.value = null
+  ecashToken.value = ''
+  sendAll.value = false
+  onchainBalance.value = null
+  feePreset.value = 'standard'
+  customConfTarget.value = null
+  customSatPerVbyte.value = null
+  resolvedFeeParams.value = {}
+  feeEstimate.value = null
+  confirming.value = false
+  confirmBalance.value = null
+  invoiceAmountSats.value = null
+  processing.value = false
+})
 
 // --- On-chain network fee: presets map to LND confirmation targets; custom
 // --- takes a block target or an explicit sat/vB rate (rate wins).