feat(job_application): show job title in web form and prevent duplicate applications

[iamkhanraheel]

Closes: #4188, #4187

Summary

• Displays the job opening title (instead of raw ID) in the job application web form when navigating from a job listing
• Adds a Prevent Duplicate Applicant option on Job Opening to block the same email from applying to the same position more than once

validateDuplicateApplication.mov

In progress - Captcha verification in web form

[greptile-apps]

Confidence Score: 4/5

Mostly safe, but the duplicate guard in before_insert applies to desk inserts too, not just web form submissions, which will block HR staff from creating re-entries on job openings with the flag enabled.

The duplicate-applicant guard fires unconditionally on every insert regardless of whether it originated from the web form or the desk. On any job opening with prevent_duplicate_applicant enabled, an HR user cannot create a second Job Applicant record for the same email — even for a rejected candidate who is being re-considered — without disabling the flag first.

hrms/hr/doctype/job_applicant/job_applicant.py — the before_insert duplicate check needs a frappe.flags.in_web_form guard to avoid blocking desk operations.

_{Reviews (3): Last reviewed commit: "Revert "feat(job_applicant): add reCAPTC..." | Re-trigger Greptile}

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[elhananjair]

@iamkhanraheel
Thank you, this is perfect.