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]/trump/TrumpPageClient.tsx

@@ -7,6 +7,8 @@ import { getPosts } from '@/lib/api'
 import { swrFetch } from '@/lib/cache'
 import PostRow from '@/components/dashboard/PostCards'
 import SystemControl from '@/components/signals/SystemControl'
+import PageHint from '@/components/ui/PageHint'
+import InfoTip from '@/components/ui/InfoTip'
 
 /**
  * System 1 — Trump (event-driven scalp). Its own dedicated page.
@@ -80,17 +82,14 @@ export default function TrumpSignalPage({ initialPosts = null }: TrumpSignalPage
       <div className="page-head">
         <div>
           <h1 className="page-title">{isZh ? '① Trump 信号' : '① Trump Signal'}</h1>
-          <p className="page-sub">
-            {`Event-driven scalp · ${sigCounts.actionable} actionable · ${trumpPosts.length} posts`}
-          </p>
+          <PageHint count={`${sigCounts.actionable} actionable / ${trumpPosts.length} posts`}>
+            Watches Trump's Truth Social posts in real time, AI-scores each one,
+            and only fires a trade when the conviction is high enough to move price.
+          </PageHint>
         </div>
         <span className="chip"><span className="live-dot" />Live</span>
       </div>
 
-      <div style={{ fontSize: 12, color: 'var(--ink-3)', lineHeight: 1.5, marginBottom: 12 }}>
-        This engine watches Trump Truth Social in real time, classifies each post, and only opens trades on high-confidence market-moving events. It is built for tight risk, short holds, and a 12-hour cooldown between entries.
-      </div>
-
       <SystemControl system="trump" />
 
       <div style={{
@@ -99,24 +98,30 @@ export default function TrumpSignalPage({ initialPosts = null }: TrumpSignalPage
       }}>
         <div className="nav-tabs" style={{ background: 'var(--bg-sunk)' }}>
           {([
-            { key: 'all' },
-            { key: 'actionable' },
-            { key: 'buy' },
-            { key: 'short' },
+            { key: 'all',        hint: 'Every post the scraper has captured.' },
+            { key: 'actionable', hint: 'Only posts the AI flagged as BUY or SHORT.' },
+            { key: 'buy',        hint: 'Posts where the AI verdict is long BTC.' },
+            { key: 'short',      hint: 'Posts where the AI verdict is short BTC.' },
           ] as const).map(f => (
             <button
               key={f.key}
               className={`nav-tab ${sigFilter === f.key ? 'active' : ''}`}
               onClick={() => setSigFilter(f.key)}
             >
-              {f.key === 'actionable' && !isZh ? '🔥 ' : ''}
-              {f.key === 'actionable' && isZh ? '🔥 ' : ''}
+              {f.key === 'actionable' ? '🔥 ' : ''}
               {signalLabels[f.key]}
               <span style={{ color: 'var(--ink-4)', marginLeft: 4 }}>{sigCounts[f.key]}</span>
             </button>
           ))}
         </div>
-        <div style={{ display: 'flex', gap: 6, flexWrap: 'wrap' }}>
+        <div style={{ display: 'flex', gap: 6, flexWrap: 'wrap', alignItems: 'center' }}>
+          <span style={{ fontSize: 11, color: 'var(--ink-4)', marginRight: 4 }}>
+            Sentiment
+            <InfoTip
+              text="Filters by the post's overall tone. Sentiment ≠ trade signal — a bearish post can still be a BUY if the market reads it as priced-in."
+              placement="left"
+            />
+          </span>
           {SENTIMENTS.map(f => (
             <button
               key={f}