feat(audit): clickable column headers with asc/desc sort

internal/server/ui/funcs.go

@@ -43,6 +43,31 @@ func funcMap() template.FuncMap {
 				return base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%v", x)))
 			}
 		},
+		// sortDir computes the dir param for a sort-header link:
+		// click the active column → toggle asc/desc; click any other
+		// column → start at desc (newest-first / Z→A) since that's
+		// the conventional default for date and frequency-style data.
+		"sortDir": func(thisCol, currentCol, currentDir string) string {
+			if thisCol != currentCol {
+				return "desc"
+			}
+			if currentDir == "asc" {
+				return "desc"
+			}
+			return "asc"
+		},
+		// sortGlyph returns the unicode arrow glyph for the sort
+		// header — empty string for inactive columns so they don't
+		// shout.
+		"sortGlyph": func(thisCol, currentCol, currentDir string) string {
+			if thisCol != currentCol {
+				return ""
+			}
+			if currentDir == "asc" {
+				return "↑"
+			}
+			return "↓"
+		},
 		"derefInt": func(p *int) int {
 			if p == nil {
 				return 0