Upset meter: the results the model found least likely

The scoreboard gains a Biggest surprises card — finished matches whose
actual outcome the frozen model priced under 30%, sorted by shock
value, each linking to its match page. Pure client derivation from
data the scoreboard already had.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/lib/i18n/en.ts

@@ -244,6 +244,10 @@ export const en = {
       marketCloser: "market closer",
     },
     emptyRows: "No frozen forecasts yet — the first snapshot is taken {minutes} minutes before kickoff.",
+    upsets: {
+      title: "Biggest surprises",
+      chance: "{pct} likely",
+    },
   },
   methodology: {
     title: "Methodology",