ui(score-card): remove fraction digits from displayed value (#87)

Closes #85.

One-line change: `{value.toFixed(2)}` -> `{value}` at line 21 of
components/score-card.tsx to render whole numbers instead of two-decimal
floats for improved readability, per the task list in the issue.

Callers passing already-rounded numbers get the same output; callers
that were previously relying on the forced two-decimal format (e.g.
for consistent visual alignment of 3.00 vs 2.50) lose that formatting
— which is the intended change per the issue.

Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>

Author: mvanhorn

components/score-card.tsx

@@ -18,7 +18,7 @@ export function ScoreCard({ title, value, highlight, subtitle }: ScoreCardProps)
       <p className="text-xs uppercase tracking-wide text-muted-foreground">{title}</p>
       <div className="flex items-baseline gap-2">
         <span className="text-2xl font-semibold text-foreground">
-          {value.toFixed(2)}
+          {value}
         </span>
         {subtitle && (
           <span className="text-xs text-muted-foreground leading-tight">{subtitle}</span>