Addressed a critical issue where students could not resume unfinished or re-granted exam attempts due to visibility constraints in the UI. Added a new isResumable helper to identify active attempts regardless of the exam window status and introduced a dedicated 'Continue where you left off' section on the student dashboard. This ensures students can access their exams even after the initial exam window has closed, and added clear 'In progress' indicators to provide better state visibility. fixing bugs

Improved exam resume flow for students - subh05sus/sparkmentis-fork