Add docstrings for the functions added

Author: ChandanMeher4

client/src/module/student/ats/AtsScorePage.tsx

@@ -38,6 +38,7 @@ import {
   CartesianGrid,
 } from "recharts";
 
+/** Recharts custom tooltip — renders score, date, role, and resume name on dot hover. */
 function ScoreTooltip({ active, payload }: any) {
   if (!active || !payload?.length) return null;
   const d = payload[0].payload;

server/src/module/ats/ats.controller.ts

@@ -145,6 +145,7 @@ export class AtsController {
     await sendEmail({ to: user.email, subject, html });
   }
 
+  /** GET /api/ats/history — returns the authenticated student's recent score history. */
   async getScoreHistory(req: Request, res: Response, next: NextFunction) {
     try {
       if (!req.user) {

server/src/module/ats/ats.service.ts

@@ -310,8 +310,8 @@ Respond with ONLY valid JSON (no markdown formatting, no code blocks, no explana
     };
   }
 
+  /** Returns the latest 30 ATS scores for a student, sorted oldest-first for charting. */
   async getScoreHistory(studentId: number) {
-    // latest 30, reversed to chronological order
     const rows = await prisma.atsScore.findMany({
       where: { studentId },
       select: {