fix: Macro fetches by source, Analytics single-basis stats, funding venue label

- Macro page fetches getPosts(200, 1, source) per active tab instead of
  filtering the latest-500 global feed — rare bottom/funding signals no longer
  vanish behind Trump posts (backend now supports ?source=).
- Analytics: compute ALL time windows from the one closed_at-filtered trades
  list; dropped the 30d-only backend /performance special-case that mixed an
  opened_at basis into the same screen as the closed_at metric grid. Trade
  fetch raised 100→500 so the local computation covers ample history.
- Funding panel shows snap.venue (capitalized) instead of hardcoded "Binance".
- lib/api: getPosts gains optional source param; FundingSnapshot gains venue.

tsc + next build clean.

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

app/[locale]/macro/MacroVibesPageClient.tsx

@@ -43,22 +43,27 @@ export default function MacroVibesPage({
   const [sentFilter, setSentFilter] = useState<SentimentFilter>('all')
   const [tab, setTab] = useState<BtcTab>('bottom')
 
+  // Tab-scoped post source. 'bottom' = MVRV/200WMA confluence,
+  // 'funding' = funding-rate extreme reversal.
+  const tabSource = tab === 'bottom' ? 'btc_bottom_reversal' : 'funding_reversal'
+
   useEffect(() => {
-    // BTC on-chain signals update daily — 30 min TTL is safe
+    // Fetch BY SOURCE, not the latest-500 global feed. These scanner signals
+    // are rare (2–4/cycle, hourly) and were being pushed off the latest-500
+    // page by frequent Trump posts — making the Macro page look empty even
+    // when signals existed. Server-side source filter guarantees we get them.
+    setLoading(true)
     swrFetch(
-      'posts-500',
+      `posts-src-${tabSource}`,
       3 * 60_000,
-      () => getPosts(500, 1),
+      () => getPosts(200, 1, tabSource),
       fresh => setPosts(fresh),
     )
       .then(p => { setPosts(p); setLoadErr('') })
       .catch(e => setLoadErr(e instanceof Error ? e.message : (isZh ? '信号加载失败' : 'Failed to load signals')))
       .finally(() => setLoading(false))
-  }, [isZh])
+  }, [tabSource, isZh])
 
-  // Tab-scoped post source. 'bottom' = MVRV/200WMA confluence,
-  // 'funding' = funding-rate extreme reversal.
-  const tabSource = tab === 'bottom' ? 'btc_bottom_reversal' : 'funding_reversal'
   const btcPosts = useMemo(
     () => posts.filter(p => (p.source || '') === tabSource),
     [posts, tabSource],
@@ -270,7 +275,9 @@ function FundingPanel({
           BTC perp funding · live
         </div>
         <div style={{ fontSize: 11, color: 'var(--ink-4)' }}>
-          {`${snap.cadence_hours}h cadence · ${snap.coverage_days}d coverage · Binance`}
+          {`${snap.cadence_hours}h cadence · ${snap.coverage_days}d coverage · ${
+            snap.venue ? snap.venue.charAt(0).toUpperCase() + snap.venue.slice(1) : 'Binance'
+          }`}
         </div>
       </div>