feat: Add Emoji Autocomplete functionality that displays matching emoji suggestions on : colon type (#1015)

* Add emoji autocomplete functionality that displays matching emoji suggestions when users type ':' followed by at least 2 characters, similar to existing mention and command autocomplete features

* Theme refinement

* Prettier formatting #1

* Prettier Formatting #2

Author: snehalsaurabh

packages/react/src/hooks/useSearchEmoji.js

@@ -0,0 +1,67 @@
+import { useCallback } from 'react';
+import emojiList from '../lib/emojiList';
+
+const useSearchEmoji = (
+  startReadEmoji,
+  setStartReadEmoji,
+  setFilteredEmojis,
+  setEmojiIndex,
+  setShowEmojiList
+) =>
+  useCallback(
+    (message) => {
+      const lastChar = message ? message[message.length - 1] : '';
+
+      if (message.length === 0) {
+        setShowEmojiList(false);
+        setStartReadEmoji(false);
+        setFilteredEmojis([]);
+        setEmojiIndex(-1);
+        return;
+      }
+
+      // Check if user is typing emoji syntax (:emoji:)
+      const emojiMatch = message.match(/:([a-zA-Z0-9_+-]*?)$/);
+
+      if (emojiMatch) {
+        const query = emojiMatch[1].toLowerCase();
+
+        // Only show suggestions if query is at least 2 characters
+        if (query.length >= 2) {
+          setStartReadEmoji(true);
+
+          const filteredEmojis = emojiList
+            .filter(
+              (emoji) =>
+                emoji.shortname.toLowerCase().includes(query) ||
+                emoji.aliases.some((alias) =>
+                  alias.toLowerCase().includes(query)
+                )
+            )
+            .slice(0, 10);
+
+          setFilteredEmojis(filteredEmojis);
+          setEmojiIndex(filteredEmojis.length > 0 ? 0 : -1);
+          setShowEmojiList(filteredEmojis.length > 0);
+        } else {
+          setShowEmojiList(false);
+          setFilteredEmojis([]);
+          setEmojiIndex(-1);
+        }
+      } else if (startReadEmoji) {
+        setStartReadEmoji(false);
+        setFilteredEmojis([]);
+        setEmojiIndex(-1);
+        setShowEmojiList(false);
+      }
+    },
+    [
+      startReadEmoji,
+      setStartReadEmoji,
+      setFilteredEmojis,
+      setEmojiIndex,
+      setShowEmojiList,
+    ]
+  );
+
+export default useSearchEmoji;