Improve emoji handling and text display in previews and generated images

Refactor emoji removal logic into a shared utility and update dependencies.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Event-Id: 59d8c635-691c-42a3-b368-902e8f16eeee
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/Q6FJ7Lw

shared/emoji.ts

@@ -0,0 +1,16 @@
+import emojiRegex from 'emoji-regex';
+
+// Cached regex instance for performance
+const emojiPattern = emojiRegex();
+
+/**
+ * Removes emojis from text while preserving other Unicode characters
+ * Uses the emoji-regex package which correctly identifies emojis without
+ * removing legitimate astral-plane characters (CJK Extension B, etc.)
+ */
+export function removeEmojis(text: string): string {
+  return text
+    .replace(emojiPattern, '')
+    .replace(/\s+/g, ' ') // Normalize whitespace
+    .trim();
+}