ui: rename 'Sentiment' filter to 'Bias' (trader vocabulary)

'Sentiment' read as generic; 'Bias' (directional/bullish bias) is the standard
crypto-trading term. Label + tooltip updated. Pure copy change — the underlying
bullish/bearish/neutral filter is unchanged.

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

app/[locale]/trump/TrumpPageClient.tsx

@@ -141,9 +141,9 @@ export default function TrumpSignalPage({ initialPosts = null }: TrumpSignalPage
             </button>
           )}
           <span style={{ fontSize: 11, color: 'var(--ink-4)', marginRight: 4 }}>
-            Sentiment
+            Bias
             <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."
+              text="Filters by the post's directional bias (bullish / bearish / neutral). Bias ≠ trade signal — a bearish post can still be a BUY if the market reads it as priced-in."
               placement="left"
             />
           </span>