ENH - simulate live crypto markets

Drive market prices from randomized server intervals with per-market momentum, global trend, mean reversion, bounded shocks, and retained history. Stream authoritative market updates into live holdings, portfolio valuations, and real detail charts while invalidating stale quotes.

frontend/testserver/smoke.cjs

@@ -119,6 +119,14 @@ function verifyBrowserTestData(dataByEndpoint) {
   assert.equal(typeof crypto.profile.priceAlerts, 'boolean')
   assert.equal(typeof crypto.markets[0].issuedSupply, 'string')
   assert(crypto.markets.every((market) => typeof market.logo === 'string'))
+  assert(
+    crypto.markets.every(
+      (market) =>
+        Array.isArray(market.priceHistory) &&
+        market.priceHistory.length >= 2 &&
+        market.priceHistory.at(-1) === Number(market.price).toFixed(2),
+    ),
+  )
   assert(
     Math.max(...crypto.markets.map((market) => Number(market.price))) >=
       1000000,