Email Notifications for Research Completion

Problem:

Due to rate limits of underlying backend APIs (LLLM calls, etc.), keyword research tasks typically take ~15 minutes to complete. Users currently need to keep the browser tab open and manually refresh to check if their research is ready, which is a poor user experience.

Proposed Solution:

Send an email notification to the user when their research task completes, allowing them to navigate away and return when results are ready.