fix: 修复 Space 模板缺少 formatCount/str 函数导致的启动 panic

- 在 theme/loader.go FuncMap 中添加 formatCount 和 str 函数
- formatCount 将 int64 格式化为中文计数（如 2.5万）
- 控制器 ActiveFolderID 改为 uint 类型，避免模板中 str 类型比较
- 控制器传递 ActiveFolder 对象，移除模板内查找逻辑
- 清理旧模板替换残留的孤儿 HTML/SVG 代码

internal/controller/space_controller.go

@@ -179,21 +179,25 @@ func (ctrl *SpaceController) loadCollectionsData(c *gin.Context, data gin.H, uid
 	data["FoldersResult"] = folders
 
 	// 默认展示第一个收藏夹的内容
-	activeFolderID := c.DefaultQuery("folder", "")
-	if activeFolderID == "" && len(folders.Folders) > 0 {
-		activeFolderID = strconv.FormatUint(uint64(folders.Folders[0].ID), 10)
+	folderParam := c.DefaultQuery("folder", "")
+	var activeFolderID uint
+	if folderParam != "" {
+		fid, parseErr := strconv.ParseUint(folderParam, 10, 64)
+		if parseErr == nil {
+			activeFolderID = uint(fid)
+		}
+	}
+	if activeFolderID == 0 && len(folders.Folders) > 0 {
+		activeFolderID = folders.Folders[0].ID
 	}
 
 	var folderItems *service.FolderItemsResult
-	if activeFolderID != "" {
-		fid, parseErr := strconv.ParseUint(activeFolderID, 10, 64)
-		if parseErr == nil {
-			items, itemErr := ctrl.favoriteSvc.ListFolderItems(uid, uint(fid), page, pageSize)
-			if itemErr != nil || items == nil {
-				folderItems = &service.FolderItemsResult{Items: []model.FolderItem{}, Total: 0}
-			} else {
-				folderItems = items
-			}
+	if activeFolderID > 0 {
+		items, itemErr := ctrl.favoriteSvc.ListFolderItems(uid, activeFolderID, page, pageSize)
+		if itemErr != nil || items == nil {
+			folderItems = &service.FolderItemsResult{Items: []model.FolderItem{}, Total: 0}
+		} else {
+			folderItems = items
 		}
 	}
 	if folderItems == nil {
@@ -201,6 +205,17 @@ func (ctrl *SpaceController) loadCollectionsData(c *gin.Context, data gin.H, uid
 	}
 	data["FolderItems"] = folderItems
 	data["ActiveFolderID"] = activeFolderID
+
+	// 找到当前激活的收藏夹对象传给模板
+	var activeFolder *model.Folder
+	for i := range folders.Folders {
+		if folders.Folders[i].ID == activeFolderID {
+			activeFolder = &folders.Folders[i]
+			break
+		}
+	}
+	data["ActiveFolder"] = activeFolder
+
 	data["Page"] = page
 	data["TotalPages"] = folderItems.TotalPages
 	data["PrevPage"] = max(1, page-1)