feat(macro-vibes): rename BTC Signal → Macro Vibes; add MacroPanel UI

Module rename across page H1, navbar tab, URL (/en/btc → /en/macro),
all metadata/JSON-LD, sitemap, llms.txt, opengraph image, and SystemControl
copy. Old /btc route fully removed.

New components/btc/MacroPanel.tsx polls /api/macro/snapshot and lays out
the 8 indicators in four sections (Valuation / Bottom trigger reference /
Market structure / Sentiment & flows / Positioning) with tone-coloured
values, current-band threshold chips, and a single CoinGlass / source
chart link per card. Composite -100..+100 needle pulses on score change.

Also fixes the pinned bottom-reversal alert on the homepage, which still
linked to the now-404 /en/btc — now routes to /en/macro.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/[locale]/trades/TradesPageClient.tsx

@@ -11,6 +11,7 @@ import { useDashboardStore } from '@/store/dashboard'
 import { getCachedViewEnvelope, getOrCreateViewEnvelope } from '@/lib/signedRequest'
 import TradeTable from '@/components/trades/TradeTable'
 import OpenPositions from '@/components/positions/OpenPositions'
+import PageHint from '@/components/ui/PageHint'
 
 export default function TradesPageClient() {
   const intlLocale = useLocale()
@@ -71,7 +72,10 @@ export default function TradesPageClient() {
       <div className="page-head">
         <div>
           <h1 className="page-title">{isZh ? '交易执行' : 'Trades'}</h1>
-          <p className="page-sub">{isZh ? '当前持仓、执行历史和按信号来源拆分的盈亏。' : 'Open positions · execution history · P&L by source'}</p>
+          <PageHint>
+            What the bot actually did with your money — currently-open positions
+            on top, closed-trade history with realized P&amp;L below.
+          </PageHint>
         </div>
       </div>