feat: add rich emoji preview in editor

Emoji inserted via the autocomplete now display as actual images/characters
instead of :shortcode: text:

- Custom emoji: renders as inline <img> with proper sizing
- Unicode emoji: renders as text with emoji font sizing
- Both show :shortcode: on hover via title attribute

CSS styles ensure proper vertical alignment with surrounding text.

src/components/editor/MentionEditor.tsx

@@ -5,8 +5,7 @@ import {
   useMemo,
   useCallback,
 } from "react";
-import { useEditor, EditorContent } from "@tiptap/react";
-import { ReactRenderer } from "@tiptap/react";
+import { useEditor, EditorContent, ReactRenderer } from "@tiptap/react";
 import StarterKit from "@tiptap/starter-kit";
 import Mention from "@tiptap/extension-mention";
 import Placeholder from "@tiptap/extension-placeholder";
@@ -62,9 +61,47 @@ export interface MentionEditorHandle {
   submit: () => void;
 }
 
-// Create emoji extension by extending Mention with a different name
+// Create emoji extension by extending Mention with a different name and custom node view
 const EmojiMention = Mention.extend({
   name: "emoji",
+
+  addNodeView() {
+    return ({ node, HTMLAttributes }) => {
+      // Create wrapper span
+      const dom = document.createElement("span");
+      dom.className = "emoji-node";
+      Object.entries(HTMLAttributes).forEach(([key, value]) => {
+        if (value !== undefined && value !== null) {
+          dom.setAttribute(key, String(value));
+        }
+      });
+
+      const { url, source, id } = node.attrs;
+      const isUnicode = source === "unicode";
+
+      if (isUnicode) {
+        // Unicode emoji - render as text span
+        const span = document.createElement("span");
+        span.className = "emoji-unicode";
+        span.textContent = url;
+        span.title = `:${id}:`;
+        dom.appendChild(span);
+      } else {
+        // Custom emoji - render as image
+        const img = document.createElement("img");
+        img.src = url;
+        img.alt = `:${id}:`;
+        img.title = `:${id}:`;
+        img.className = "emoji-image";
+        img.draggable = false;
+        dom.appendChild(img);
+      }
+
+      return {
+        dom,
+      };
+    };
+  },
 });
 
 export const MentionEditor = forwardRef<

src/index.css

@@ -314,3 +314,23 @@ body.animating-layout
 .ProseMirror .mention:hover {
   background-color: hsl(var(--primary) / 0.2);
 }
+
+/* Emoji styles */
+.ProseMirror .emoji-node {
+  display: inline-flex;
+  align-items: center;
+  vertical-align: middle;
+}
+
+.ProseMirror .emoji-image {
+  height: 1.2em;
+  width: auto;
+  vertical-align: middle;
+  object-fit: contain;
+}
+
+.ProseMirror .emoji-unicode {
+  font-size: 1.1em;
+  line-height: 1;
+  vertical-align: middle;
+}