fix(ui): retheme comparison toast to match site palette

- Switch from dark (#1a1612) to site's warm cream background
- Clear all button now visible as a text button with muted/coral hover
- Remove scroll bar: no max-height cap needed since 5 schools max
- Compare Now button uses coral accent to match primary CTAs
- School items use bg-secondary (beige) consistent with site cards

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

nextjs-app/components/ComparisonToast.tsx

@@ -62,7 +62,7 @@ export function ComparisonToast() {
               ))}
             </div>
             <div className={styles.toastActions}>
-              <button onClick={clearAll} className="btn btn-tertiary btn-sm" style={{ color: 'rgba(250,247,242,0.7)', borderColor: 'rgba(255,255,255,0.15)' }}>Clear all</button>
+              <button onClick={clearAll} className={styles.btnClearAll}>Clear all</button>
               <Link href="/compare" className={styles.btnCompare}>Compare Now</Link>
             </div>
           </>