fix(ui): pluralise the verb, not just the noun, in the attribution tooltip

Read "100% of 1 attributed block point here" on the live site.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jp6a8EDar9ueEhAxzep4V5

web/src/components/Leaderboard.tsx

@@ -67,8 +67,9 @@ function Row({
               className={tentative ? 'chip chip-named chip-guess' : 'chip chip-named'}
               title={
                 `Name inferred from telemetry: ${Math.round(row.confidence * 100)}% of ` +
-                `${row.attribution_votes} attributed block${row.attribution_votes === 1 ? '' : 's'} ` +
-                `point here. Best effort — a later block can correct it.`
+                `${row.attribution_votes} attributed ` +
+                (row.attribution_votes === 1 ? 'block points' : 'blocks point') +
+                ` here. Best effort — a later block can correct it.`
               }
             >
               {tentative ? 'node?' : 'node'}