fix: EC UI template error when viewing shard details (#7955)

* fix: EC UI template error when viewing shard details

Fixed field name mismatch in volume.html where it was using .ShardDetails
instead of .Shards. Added a robust type conversion wrapper in templates.go
to handle int64 to uint64 conversion for bytesToHumanReadable.
Added regression test to ensure future stability.

* refactor: improve bytesToHumanReadable and test robustness

- Handled more integer types (uint32, int32, uint) in bytesToHumanReadable.
- Improved volume_test.go to verify both shards are formatted correctly.

* refactor: add bounds checking to bytesToHumanReadable

Added checks for negative values in signed integer types to avoid incorrect
formatting when converting to uint64.
Addressed feedback from coderabbitai.

weed/server/volume_server_ui/templates.go

@@ -3,16 +3,45 @@ package volume_server_ui
 import (
 	_ "embed"
 	"fmt"
-	"github.com/seaweedfs/seaweedfs/weed/util"
 	"html/template"
 	"strconv"
 	"strings"
+
+	"github.com/seaweedfs/seaweedfs/weed/util"
 )
 
 func percentFrom(total uint64, part_of uint64) string {
 	return fmt.Sprintf("%.2f", (float64(part_of)/float64(total))*100)
 }
 
+func bytesToHumanReadable(b interface{}) string {
+	switch v := b.(type) {
+	case uint64:
+		return util.BytesToHumanReadable(v)
+	case int64:
+		if v < 0 {
+			return fmt.Sprintf("%d B", v)
+		}
+		return util.BytesToHumanReadable(uint64(v))
+	case int:
+		if v < 0 {
+			return fmt.Sprintf("%d B", v)
+		}
+		return util.BytesToHumanReadable(uint64(v))
+	case uint32:
+		return util.BytesToHumanReadable(uint64(v))
+	case int32:
+		if v < 0 {
+			return fmt.Sprintf("%d B", v)
+		}
+		return util.BytesToHumanReadable(uint64(v))
+	case uint:
+		return util.BytesToHumanReadable(uint64(v))
+	default:
+		return fmt.Sprintf("%v", b)
+	}
+}
+
 func join(data []int64) string {
 	var ret []string
 	for _, d := range data {
@@ -23,7 +52,7 @@ func join(data []int64) string {
 
 var funcMap = template.FuncMap{
 	"join":                 join,
-	"bytesToHumanReadable": util.BytesToHumanReadable,
+	"bytesToHumanReadable": bytesToHumanReadable,
 	"percentFrom":          percentFrom,
 	"isNotEmpty":           util.IsNotEmpty,
 }