Clear timed-hidden on score reveal; assert fullwidth class in test

displayScore() now removes the timed-hidden class before showing the
score, so the element isn't left with both timed-hidden and
timed-visible (which only resolved correctly by CSS source order).
Update the construction test to assert the timed-container-fullwidth
class instead of the inline max-width style.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NSYdBnh54WSQhG6Y4MAQ1x

Author: bnmnetp

bases/rsptx/interactives/runestone/timed/js/timed.js

@@ -1252,6 +1252,10 @@ export default class Timed extends RunestoneBase {
         );
     }
     displayScore() {
+        // Reveal the score, clearing the initial hidden state so the element
+        // isn't left with both timed-hidden and timed-visible (which only
+        // works by CSS source order).
+        this.scoreDiv.classList.remove("timed-hidden");
         if (this.showResults) {
             var scoreString = "";
             var numQuestions;

bases/rsptx/interactives/runestone/timed/test/timed.test.js

@@ -98,7 +98,9 @@ describe("construction", () => {
         expect(isHidden(exam.timerContainer)).toBe(true);
         expect(exam.nopause).toBe(true);
         expect(exam.pauseBtn.parentElement).toBe(null);
-        expect(exam.containerDiv.style.maxWidth).toBe("none");
+        expect(
+            exam.containerDiv.classList.contains("timed-container-fullwidth"),
+        ).toBe(true);
         expect(exam.showFeedback).toBe(false);
     });
 });