feat(wallet): total-bitcoin row at top of wallet card; on-chain gets a chain icon

The wallet card (Home + Web5 views) now leads with a Total Bitcoin row
summing all rails (on-chain + lightning + cashu + fedimint + ark), using
the orange ₿ mark. The on-chain row swaps ₿ for a link/chain icon.

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

neode-ui/src/views/web5/Web5Wallet.vue

@@ -95,10 +95,21 @@
     <div v-if="walletError" class="alert-error mb-3">{{ walletError }}</div>
 
     <div class="space-y-3 flex-1 min-h-0">
+      <!-- Total Balance -->
+      <div class="flex items-center justify-between p-3 bg-white/10 rounded-lg">
+        <div class="flex items-center gap-3">
+          <span class="text-lg text-orange-500 font-bold">₿</span>
+          <span class="text-white text-sm font-medium">{{ t('web5.totalBitcoin') }}</span>
+        </div>
+        <span class="text-white text-sm font-semibold">{{ (lndOnchainBalance + lndChannelBalance + ecashBalance).toLocaleString() }} sats</span>
+      </div>
+
       <!-- On-chain Balance -->
       <div class="flex items-center justify-between p-3 bg-white/5 rounded-lg">
         <div class="flex items-center gap-3">
-          <span class="text-lg text-orange-500 font-bold">₿</span>
+          <svg class="w-5 h-5 text-orange-500" role="img" aria-label="On-chain" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13.828 10.172a4 4 0 00-5.656 0l-4 4a4 4 0 105.656 5.656l1.102-1.101m-.758-4.899a4 4 0 005.656 0l4-4a4 4 0 00-5.656-5.656l-1.1 1.1" />
+          </svg>
           <span class="text-white/80 text-sm">{{ t('web5.onChain') }}</span>
         </div>
         <span class="text-orange-500 text-sm font-medium">{{ lndOnchainBalance.toLocaleString() }} sats</span>