feat: 调用gpt\nano模型方式修改，功能优化，增加下载采集图片等功能

extension/entrypoints/sidepanel/index.html

@@ -14,6 +14,7 @@
       --primary: #8b5cf6;        /* 紫（ozon-seller-kit v2 主题色） */
       --primary-hover: #7c3aed;
       --primary-ring: rgba(139, 92, 246, 0.12);
+      --primary-soft: #a78bfa;   /* 主题色同色系偏淡（未勾选描边/✓） */
       --green: #52c41a;
       --red: #ff4d4f;
       --warn-bg: #fffbe6;
@@ -49,6 +50,12 @@
     .section-images .section-head { padding: 0 16px; }
     .section-images .img-groups { padding: 2px 8px 0 16px; }
     .section-images .empty { margin: 0 16px; }
+    .img-export-bar {
+      display: flex; align-items: center; gap: 10px;
+      margin: 10px 16px 2px; padding-top: 10px;
+      border-top: 1px solid var(--border);
+    }
+    .img-export-bar .hint { font-size: 12px; color: var(--text-2); }
     .divider { border-top: 1px solid var(--border); margin: 12px 0; }
 
     /* ── 顶部 ── */
@@ -174,11 +181,11 @@
     .img-cell.on { border-color: var(--primary); }
     .img-cell .tick {
       position: absolute; top: 5px; left: 5px; width: 18px; height: 18px;
-      border-radius: 50%; border: 1.5px solid #fff;
+      border-radius: 50%; border: 1.5px solid var(--primary-soft);
       background: rgba(255, 255, 255, 0.55); display: flex; align-items: center; justify-content: center;
-      color: #fff; font-size: 11px; transition: all .15s; cursor: pointer;
+      color: var(--primary-soft); font-size: 11px; transition: all .15s; cursor: pointer;
     }
-    .img-cell.on .tick { background: var(--primary); border-color: var(--primary); }
+    .img-cell.on .tick { background: var(--primary); border-color: var(--primary); color: #fff; }
     .img-cell .variant {
       position: absolute; bottom: 0; left: 0; right: 0;
       background: rgba(0, 0, 0, 0.55); color: #fff; font-size: 11px;
@@ -262,9 +269,15 @@
     .plan-row {
       display: flex; align-items: center; gap: 10px;
       padding: 7px 10px; border: 1px solid var(--border); border-radius: 6px;
-      background: var(--card-soft);
+      background: var(--card-soft); cursor: pointer;
     }
+    .plan-row:hover { border-color: var(--primary); }
     .plan-row.off { opacity: .45; }
+    .plan-all-toggle {
+      display: flex; align-items: center; gap: 10px;
+      margin: 8px 2px 2px; padding-top: 6px;
+      border-top: 1px dashed var(--border);
+    }
     .plan-main { flex: 1; min-width: 0; display: flex; align-items: center; gap: 8px; }
     .plan-title { font-size: 13.5px; font-weight: 600; white-space: nowrap; }
     .variant-chip {