Fix assignee filter bug in List

service/mentions.go

@@ -0,0 +1,17 @@
+package service
+
+import (
+	"maps"
+	"regexp"
+	"slices"
+)
+
+var mentionRegex = regexp.MustCompile(`@([a-z0-9_]+)`)
+
+func mentions(t string) []string {
+	seen := make(map[string]bool)
+	for _, m := range mentionRegex.FindAllStringSubmatch(t, -1) {
+		seen[m[1]] = true
+	}
+	return slices.Collect(maps.Keys(seen))
+}