admin: add cursor-based pagination to file browser (#7891)

* adjust menu items

* admin: add cursor-based pagination to file browser

- Implement cursor-based pagination using lastFileName parameter
- Add customizable page size selector (20/50/100/200 entries)
- Add compact pagination controls in header and footer
- Remove summary cards for cleaner UI
- Make directory names clickable to return to first page
- Support forward-only navigation (Next button)
- Preserve cursor position when changing page size
- Remove sorting to align with filer's storage order approach

* Update file_browser_templ.go

* admin: remove directory icons from breadcrumbs

* Update file_browser_templ.go

* admin: address PR comments

- Fix fragile EOF check: use io.EOF instead of string comparison
- Cap page size at 200 to prevent potential DoS
- Remove unused helper functions from template
- Use safer templ script for page size selector to prevent XSS

* admin: cleanup redundant first button

* Update file_browser_templ.go

* admin: remove entry counting logic

* admin: remove unused variables in file browser data

* admin: remove unused logic for FirstFileName and HasPrevPage

* admin: remove unused TotalEntries and TotalSize fields

* Update file_browser_data.go

weed/admin/handlers/file_browser_handlers.go

@@ -63,8 +63,19 @@ func (h *FileBrowserHandlers) ShowFileBrowser(c *gin.Context) {
 	// Normalize Windows-style paths for consistency
 	path = util.CleanWindowsPath(path)
 
-	// Get file browser data
-	browserData, err := h.adminServer.GetFileBrowser(path)
+	// Get pagination parameters
+	lastFileName := c.DefaultQuery("lastFileName", "")
+
+	pageSize, err := strconv.Atoi(c.DefaultQuery("limit", "20"))
+	if err != nil || pageSize < 1 {
+		pageSize = 20
+	}
+	if pageSize > 200 {
+		pageSize = 200
+	}
+
+	// Get file browser data with cursor-based pagination
+	browserData, err := h.adminServer.GetFileBrowser(path, lastFileName, pageSize)
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get file browser data: " + err.Error()})
 		return