[UX/FIX] Replace browser confirm dialogs on Scans page with in-app confirmation modals

[utksh1]

Summary

The Scans page uses browser window.confirm dialogs for deleting one scan and purging all records. Replace these with accessible in-app confirmation modals that match the SecuScan UI.

Problem

Native confirm dialogs are abrupt, hard to style, and provide limited context for destructive actions. The purge-all action is especially high impact and should clearly explain what will be removed before the user confirms.

Proposed solution

Replace browser confirmation prompts in frontend/src/pages/Scans.tsx with reusable or local confirmation modal UI.

Expected behavior:

• Deleting one scan opens a modal naming the scan/task when possible.
• Purging all records opens a stronger warning modal.
• Confirm and cancel actions are keyboard accessible.
• The modal can be dismissed safely without triggering deletion.
• Existing toast success/error behavior remains.

Acceptance criteria

• window.confirm is no longer used in Scans.tsx.
• Single delete and purge-all actions both require explicit in-app confirmation.
• Modals have clear titles, descriptions, confirm/cancel controls, and focus-friendly markup.
• Existing delete API calls still work.
• Frontend tests cover cancel and confirm paths for at least one destructive action.

Suggested files

• frontend/src/pages/Scans.tsx
• Optional shared component under frontend/src/components/
• frontend/testing/unit/pages/

Test plan

• Run frontend tests.
• Manually verify delete, cancel, purge, and API error flows.

[aaniya22]

Hi @utksh1 I'd like to work on this issue!

I'm an experienced full-stack developer participating in GSSoC '26.

Could you please assign this to me? I'll start right away!

[khat190]

"Hi @utksh1, I'm a GSSoC'26 contributor. I'd like to work on this issue. Please assign it to me. Thanks.

[Lakshana-K-1907]

Hi @utksh1 . I am GSSoC'2026 contributor. I am a cybersecurity engineer pursuing 2nd year. I'd like to work on this project please assign it to me. Thanks

[varunisood30-crypto]

hi @utksh1

I’m new to open source but I’d love to work on this issue and learn while contributing under GSSoC'26.

please assign this issue to me.