拆分宣传页视图并扩充 Mock 数据，合作订单支持获客员备注名并修复线索图片网格尺寸。

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

suixinkan/Features/ScenicPromotion/Views/ScenicPromotionMediaEmptyView.swift

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+//
+//  ScenicPromotionMediaEmptyView.swift
+//  suixinkan
+//
+//  Created by Codex on 2026/7/2.
+//
+
+import SwiftUI
+
+/// 宣传页当前视频 / 照片模式没有素材时展示的空状态。
+struct ScenicPromotionMediaEmptyView: View {
+    let mode: ScenicPromotionMediaMode
+
+    var body: some View {
+        VStack(spacing: 12) {
+            Image(systemName: mode == .video ? "play.rectangle.fill" : "photo.on.rectangle.angled")
+                .font(.system(size: 44, weight: .semibold))
+                .foregroundStyle(Color(hex: 0x57A2FF))
+            Text(mode == .video ? "暂无视频" : "暂无照片")
+                .font(.system(size: 19, weight: .bold))
+                .foregroundStyle(Color(hex: 0x1E5DA8))
+            Text("敬请期待更多精彩内容")
+                .font(.system(size: 13, weight: .medium))
+                .foregroundStyle(Color(hex: 0x6B83A8))
+        }
+        .frame(maxWidth: .infinity, minHeight: 172)
+    }
+}
+
+#if DEBUG
+#Preview("素材空状态-视频") {
+    ScenicPromotionMediaEmptyView(mode: .video)
+        .padding()
+        .background(.white.opacity(0.72), in: RoundedRectangle(cornerRadius: 18))
+        .padding()
+}
+
+#Preview("素材空状态-照片") {
+    ScenicPromotionMediaEmptyView(mode: .photo)
+        .padding()
+        .background(.white.opacity(0.72), in: RoundedRectangle(cornerRadius: 18))
+        .padding()
+}
+#endif