feat: update card router to send emails on mention

packages/shared/src/utils/index.ts

@@ -4,3 +4,4 @@ export * from "./subscriptions";
 export * from "./email";
 export * from "./dueDateFilters";
 export * from "./s3";
+export * from "./mentions";

packages/shared/src/utils/mentions.ts

@@ -0,0 +1,22 @@
+/**
+ * Parses mention data-id attributes from HTML content
+ * Mentions are stored as: <span data-type="mention" data-id="..." data-label="...">@label</span>
+ * @param htmlContent - The HTML content to parse
+ * @returns Array of unique mention public IDs
+ */
+export function parseMentionsFromHTML(htmlContent: string): string[] {
+  if (!htmlContent) return [];
+
+  // Match all mention spans with data-id attributes
+  const mentionRegex = /<span[^>]*data-type="mention"[^>]*data-id="([^"]+)"[^>]*>/gi;
+  const matches = Array.from(htmlContent.matchAll(mentionRegex));
+  
+  // Extract unique mention IDs
+  const mentionIds = matches
+    .map((match) => match[1])
+    .filter((id): id is string => !!id && id.length >= 12);
+
+  // Return unique IDs
+  return Array.from(new Set(mentionIds));
+}
+