feat(ui): one-click 'Hide off-topic' toggle on the Trump feed

Lets the user collapse every post the AI judged off-topic (not crypto-related,
never scored) so the feed shows only real signals.

- PostCards exports isAiScored(post) as the single source of truth for what
  counts as noise — the card de-emphasis and the list filter now share it, so
  they can never disagree.
- TrumpPageClient: 'Hide off-topic (N)' toggle in the filter row (only shown
  when N>0), with live noise count. Resets to page 1 on toggle.

tsc + build clean.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/[locale]/trump/TrumpPageClient.tsx

@@ -5,7 +5,7 @@ import { useLocale } from 'next-intl'
 import type { TrumpPost } from '@/types'
 import { getPosts } from '@/lib/api'
 import { swrFetch } from '@/lib/cache'
-import PostRow from '@/components/dashboard/PostCards'
+import PostRow, { isAiScored } from '@/components/dashboard/PostCards'
 import SystemControl from '@/components/signals/SystemControl'
 import PageHint from '@/components/ui/PageHint'
 import InfoTip from '@/components/ui/InfoTip'
@@ -29,6 +29,7 @@ export default function TrumpSignalPage({ initialPosts = null }: TrumpSignalPage
   const [loadErr, setLoadErr]   = useState('')
   const [sentFilter, setSentFilter] = useState<SentimentFilter>('all')
   const [sigFilter, setSigFilter]   = useState<SignalFilter>('all')
+  const [hideNoise, setHideNoise]   = useState(false)
   const [page, setPage]         = useState(1)
 
 
@@ -49,13 +50,19 @@ export default function TrumpSignalPage({ initialPosts = null }: TrumpSignalPage
     [posts],
   )
 
+  const noiseCount = useMemo(
+    () => trumpPosts.filter(p => !isAiScored(p)).length,
+    [trumpPosts],
+  )
+
   const filtered = useMemo(() => trumpPosts.filter(p => {
+    if (hideNoise && !isAiScored(p)) return false
     if (sentFilter !== 'all' && p.sentiment !== sentFilter) return false
     if (sigFilter === 'actionable' && p.signal !== 'buy' && p.signal !== 'short') return false
     if (sigFilter === 'buy'   && p.signal !== 'buy')   return false
     if (sigFilter === 'short' && p.signal !== 'short') return false
     return true
-  }), [trumpPosts, sentFilter, sigFilter])
+  }), [trumpPosts, sentFilter, sigFilter, hideNoise])
 
   const totalPages = Math.max(1, Math.ceil(filtered.length / PAGE_SIZE))
   const safePage   = Math.min(page, totalPages)
@@ -116,6 +123,23 @@ export default function TrumpSignalPage({ initialPosts = null }: TrumpSignalPage
 
         {/* Sentiment filter */}
         <div style={{ display: 'flex', gap: 6, flexWrap: 'wrap', alignItems: 'center' }}>
+          {/* One-click collapse of off-topic (non-crypto, un-scored) posts. */}
+          {noiseCount > 0 && (
+            <button
+              onClick={() => { setHideNoise(v => !v); setPage(1) }}
+              title="Collapse posts the AI judged off-topic (not crypto-related)"
+              style={{
+                padding: '4px 10px', borderRadius: 6,
+                border: '1px solid var(--line)',
+                background: hideNoise ? 'var(--ink)' : 'transparent',
+                color: hideNoise ? 'var(--bg)' : 'var(--ink-3)',
+                fontSize: 11, cursor: 'pointer', fontWeight: 600,
+                marginRight: 4,
+              }}
+            >
+              {hideNoise ? `✓ Off-topic hidden (${noiseCount})` : `🙈 Hide off-topic (${noiseCount})`}
+            </button>
+          )}
           <span style={{ fontSize: 11, color: 'var(--ink-4)', marginRight: 4 }}>
             Sentiment
             <InfoTip