feat(share): 文本分享指引框重做为分步引导卡片(参考截图)，去掉系统分享

ShareGuideDialog: 居中卡片 标题{渠道}分享准备完成 + 内容已复制到剪贴板 + 微信/QQ/抖音三套分步指引
+ 两按钮(稍后分享/立即打开{渠道}，渠道主题色)。文本不再提供系统分享(移除onGuideAction system分支+systemText)。
容器移除 contentKind 接线。

feature_capabilities/src/main/ets/providers/ShareProvider.ets

@@ -241,13 +241,8 @@ export class ShareProvider implements CapabilityProvider {
       if (platform === 'wechat') {
         this.reportResult(2, reportType);
       }
-    } else if (action === 'system') {
-      this.systemText(uiCtx, bean);
-      if (platform === 'wechat') {
-        this.reportResult(2, reportType);
-      }
     } else {
-      // cancel
+      // 稍后分享 / 取消：仅微信回执取消。
       if (platform === 'wechat') {
         this.reportResult(3, reportType);
       }
@@ -299,14 +294,6 @@ export class ShareProvider implements CapabilityProvider {
 
   // —— 系统分享（图片可靠交付 / 文本兜底；文本不下发 url）——
 
-  private systemText(uiCtx: common.UIAbilityContext, bean: SharetypeBean): void {
-    const text: string = buildShareText(bean.title, bean.description);
-    const record: systemShare.SharedRecord = {
-      utd: utd.UniformDataType.PLAIN_TEXT, content: text !== '' ? text : ' ',
-    };
-    this.showSystemShare(uiCtx, record);
-  }
-
   private systemImage(uiCtx: common.UIAbilityContext, filePath: string, bean: SharetypeBean): void {
     const typeId: string =
       utd.getUniformDataTypeByFilenameExtension(this.extOf(filePath), utd.UniformDataType.IMAGE);