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/locales/en.json

@@ -415,6 +415,7 @@
     "totalEarned": "Total Earned",
     "monthlyAvg": "Monthly Avg",
     "ecashBalance": "Ecash Balance",
+    "totalBitcoin": "Total Bitcoin",
     "onChain": "On-chain",
     "lightning": "Lightning",
     "ecash": "Ecash",

neode-ui/src/locales/es.json

@@ -413,6 +413,7 @@
     "totalEarned": "Total ganado",
     "monthlyAvg": "Promedio mensual",
     "ecashBalance": "Saldo Ecash",
+    "totalBitcoin": "Bitcoin total",
     "onChain": "On-chain",
     "lightning": "Lightning",
     "ecash": "Ecash",