style(miniprogram): add invoice thumbnail grid styles for bx.

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/styles/bx-theme.scss

@@ -1174,6 +1174,190 @@
   font-size: 16px;
 }
 
+/* 关联发票缩略图（申请已选 / 详情 / 选择弹层） */
+.bx-page .invoice-thumb-grid {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+  margin-top: 12px;
+}
+
+.bx-page .invoice-thumb {
+  position: relative;
+  width: 72px;
+}
+
+.bx-page .invoice-thumb__media {
+  width: 72px;
+  height: 72px;
+  border-radius: 8px;
+  overflow: hidden;
+  border: 1px solid var(--border);
+  background: #f1f5f9;
+}
+
+.bx-page .invoice-thumb__media image {
+  width: 100%;
+  height: 100%;
+}
+
+.bx-page .invoice-thumb__doc {
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 2px;
+  padding: 6px;
+  font-size: 10px;
+  color: var(--text-muted);
+  text-align: center;
+}
+
+.bx-page .invoice-thumb__doc-ext {
+  font-weight: 700;
+  font-size: 12px;
+  color: var(--text-sec);
+}
+
+.bx-page .invoice-thumb__meta {
+  width: 72px;
+  margin-top: 4px;
+  text-align: center;
+}
+
+.bx-page .invoice-thumb__amt {
+  display: block;
+  font-size: 11px;
+  font-weight: 600;
+  color: var(--primary-dark);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.bx-page .invoice-thumb__date {
+  display: block;
+  font-size: 10px;
+  color: var(--text-muted);
+  margin-top: 1px;
+}
+
+.bx-page .invoice-thumb__del {
+  position: absolute;
+  top: 2px;
+  right: 2px;
+  z-index: 2;
+  width: 20px;
+  height: 20px;
+  line-height: 20px;
+  text-align: center;
+  border-radius: 50%;
+  background: rgba(15, 23, 42, 0.55);
+  color: #fff;
+  font-size: 13px;
+}
+
+.bx-page .bx-sheet__body--invoice-thumbs {
+  padding: 12px;
+  max-height: 50vh;
+}
+
+.bx-page .invoice-pick-grid {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 10px;
+}
+
+.bx-page .invoice-pick-card {
+  position: relative;
+  border: 1.5px solid var(--border);
+  border-radius: 8px;
+  overflow: hidden;
+  background: var(--surface);
+  padding: 0;
+  text-align: left;
+}
+
+.bx-page .invoice-pick-card.is-selected {
+  border-color: var(--primary);
+  box-shadow: 0 0 0 1px var(--primary);
+}
+
+.bx-page .invoice-pick-card__check {
+  position: absolute;
+  top: 6px;
+  right: 6px;
+  z-index: 2;
+  width: 22px;
+  height: 22px;
+  border-radius: 50%;
+  border: 1.5px solid #fff;
+  background: rgba(15, 23, 42, 0.25);
+  color: #fff;
+  font-size: 12px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.bx-page .invoice-pick-card.is-selected .invoice-pick-card__check {
+  background: var(--primary);
+}
+
+.bx-page .invoice-pick-card__preview {
+  width: 100%;
+  aspect-ratio: 1 / 1;
+  background: #f1f5f9;
+  overflow: hidden;
+}
+
+.bx-page .invoice-pick-card__preview image {
+  width: 100%;
+  height: 100%;
+}
+
+.bx-page .invoice-pick-card__doc {
+  width: 100%;
+  height: 100%;
+  min-height: 96px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 4px;
+  padding: 8px;
+  font-size: 11px;
+  color: var(--text-muted);
+  text-align: center;
+}
+
+.bx-page .invoice-pick-card__meta {
+  padding: 6px 8px 8px;
+  border-top: 1px solid var(--border);
+}
+
+.bx-page .invoice-pick-card__amt {
+  font-size: 12px;
+  font-weight: 700;
+  color: var(--primary-dark);
+}
+
+.bx-page .invoice-pick-card__date {
+  margin-top: 2px;
+  font-size: 10px;
+  color: var(--text-muted);
+}
+
+.bx-page .invoice-pick-footer-tip {
+  margin-top: 10px;
+  text-align: center;
+  font-size: 12px;
+  color: var(--text-muted);
+  padding: 4px 0 8px;
+}
+
 .bx-page .bx-sheet-mask {
   position: fixed;
   inset: 0;