feat(editor): enable ticket mentions on new-ticket forms and fix @mention popup layering\n\n- New Ticket page/dialog/portal now support @ to link tickets\n- Mention popup uses fixed strategy + high z-index\n- Add minimal Tippy box styling to globals.css\n- Keeps existing server-side permissions for mentions

src/components/ui/rich-text-editor.tsx

@@ -16,6 +16,9 @@ import Placeholder from "@tiptap/extension-placeholder"
 import Mention from "@tiptap/extension-mention"
 import { ReactRenderer } from "@tiptap/react"
 import tippy, { type Instance, type Props as TippyProps } from "tippy.js"
+// Nota: o CSS do Tippy não é obrigatório, mas melhora muito a renderização
+// do popover de sugestões. O componente aplica um z-index alto e estratégia
+// "fixed" para evitar problemas de sobreposição/scrolling mesmo sem CSS global.
 import { cn } from "@/lib/utils"
 import sanitize from "sanitize-html"
 import { Button } from "@/components/ui/button"
@@ -357,6 +360,8 @@ const TicketMentionExtension = Mention.extend({
             interactive: true,
             trigger: "manual",
             placement: "bottom-start",
+            zIndex: 99999,
+            popperOptions: { strategy: "fixed" },
           })
         },
         onUpdate(props) {