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/WalletScanModal.vue

@@ -51,10 +51,16 @@
                 </svg>
                 <p class="text-sm text-white/60 text-center">How do you want to read the QR?</p>
                 <!-- hasNativeQr: on the companion (plain http, no getUserMedia)
-                     the native bridge still provides a live camera -->
-                <button v-if="!liveCameraUnavailable || hasNativeQr" @click="chooseCamera" class="glass-button w-full px-4 py-2.5 rounded-lg text-sm font-medium">
+                     the native bridge still provides a live camera. On plain-http
+                     desktop the button stays VISIBLE — hiding it read as "the
+                     scanner is gone" (operator, 2026-08-05); choosing it surfaces
+                     the browser's HTTPS requirement with the fallbacks instead. -->
+                <button @click="chooseCamera" class="glass-button w-full px-4 py-2.5 rounded-lg text-sm font-medium">
                   Scan with camera
                 </button>
+                <p v-if="liveCameraUnavailable && !hasNativeQr" class="text-[11px] text-white/40 text-center -mt-1">
+                  Your browser only allows live camera on HTTPS pages — the photo and paste options below always work.
+                </p>
                 <button @click="photoInput?.click()" class="glass-button w-full px-4 py-2.5 rounded-lg text-sm font-medium">
                   Upload / take a photo of the QR
                 </button>