feat(ui): dual-ecash wallet settings, buy-peer-files, seed backup, assorted fixes

- Tabbed Wallet Settings modal (Cashu + Fedimint) and dual-balance wallet card
- Buy a peer's paid file (ecash / node Lightning / on-chain / external QR)
- Recovery-phrase reveal + backup section; onboarding seed retry resilience
- NetBird HTTPS launch, remote-control two-finger scroll + external-open
- Shared BackButton, single-v version label, mesh Bitcoin header toggles

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

neode-ui/src/views/fleet/FleetNodeDetail.vue

@@ -19,7 +19,7 @@
       </div>
       <div class="monitoring-stat-card">
         <p class="text-xs text-white/50 uppercase tracking-wide">Version</p>
-        <p class="text-lg font-bold text-white">v{{ node.version }}</p>
+        <p class="text-lg font-bold text-white">{{ $ver(node.version) }}</p>
       </div>
       <div class="monitoring-stat-card">
         <p class="text-xs text-white/50 uppercase tracking-wide">Uptime</p>

neode-ui/src/views/fleet/FleetNodeGrid.vue

@@ -36,7 +36,7 @@
             ></span>
             <span class="text-sm font-semibold text-white truncate">{{ fleetNodeDisplayName(node) }}</span>
           </div>
-          <span class="fleet-version-badge">v{{ node.version }}</span>
+          <span class="fleet-version-badge">{{ $ver(node.version) }}</span>
         </div>
         <div class="mb-3 truncate text-xs text-white/40">
           {{ fleetNodeSubtitle(node) }}