Make crossword view full-width to avoid grid scrolling

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

public/styles.css

@@ -36,12 +36,18 @@ body {
 #view-quiz,
 #view-flashcards,
 #view-practice,
-#view-test,
-#view-crossword {
+#view-test {
   max-width: 960px;
   text-align: left;
 }
 
+#view-crossword {
+  max-width: 100%;
+  text-align: left;
+  padding-left: 1.25rem;
+  padding-right: 1.25rem;
+}
+
 .app-title { font-size: 2.4rem; margin-bottom: 0.5rem; }
 .subtitle { font-size: 1.25rem; color: var(--muted); margin-bottom: 2rem; }
 .hint { color: var(--muted); margin: 1rem 0; }