Admin page: show actual file presence dot per row

internal/web/handler.go

@@ -2,6 +2,7 @@ package web
 
 import (
 	"ResendIt/internal/file"
+	"os"
 	"strconv"
 
 	"github.com/gin-gonic/gin"
@@ -70,10 +71,35 @@ func (h *Handler) AdminPage(c *gin.Context) {
 		return
 	}
 
+	// Only check files on the current page.
+	// Status meanings:
+	// - green: file exists on disk
+	// - red: file missing
+	// - rainbow: stat error (something unexpected)
+	type AdminFileView struct {
+		file.FileRecord
+		ActualStatus string
+	}
+
+	adminFiles := make([]AdminFileView, 0, len(files))
+	for _, f := range files {
+		status := "red"
+		if f.Path != "" {
+			if _, err := os.Stat(f.Path); err == nil {
+				status = "green"
+			} else if os.IsNotExist(err) {
+				status = "red"
+			} else {
+				status = "rainbow"
+			}
+		}
+		adminFiles = append(adminFiles, AdminFileView{FileRecord: f, ActualStatus: status})
+	}
+
 	totalPages := (totalCount + limit - 1) / limit
 
 	c.HTML(200, "admin.html", gin.H{
-		"Files":      files,
+		"Files":      adminFiles,
 		"Page":       page,
 		"TotalPages": totalPages,
 	})