fix: clamp review star value to 0-5 range to prevent repeat() RangeError

WeRead API returns star=100 for book reviews and star=-1 for thoughts,
causing '☆'.repeat(5-100) to throw 'Invalid count value: -95'.

static/js/app.js

@@ -813,7 +813,8 @@ function openNotes(bookId, title, author, cover) {
             if (data.review_count > 0) {
                 html += `<div class="notes-section-title">💭 想法/点评 (${data.review_count})</div>`;
                 data.reviews.forEach((r) => {
-                    const stars = r.star > 0 ? `<span class="review-star">${"★".repeat(r.star)}${"☆".repeat(5 - r.star)}</span>` : "";
+                    const starVal = Math.max(0, Math.min(5, parseInt(r.star) || 0));
+                    const stars = starVal > 0 ? `<span class="review-star">${"★".repeat(starVal)}${"☆".repeat(5 - starVal)}</span>` : "";
                     html += `
                         <div class="review-item">
                             ${escapeHtml(r.content)}