[frontend] CSVUploader has no file size validation before parsing

[Wilfred007]

Description

CSVUploader.tsx reads and parses the entire selected file with no size check beforehand. A multi-megabyte file can hang the browser tab during parsing with no warning shown to the user first.

Where

frontend/src/components — CSVUploader.tsx

Acceptance Criteria

• Add a maximum file size check before attempting to parse, with a clear error message when exceeded
• Add a test for the oversized-file rejection

[afeezorobsco-cyber]

@afeezorobsco-cyber has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer, i would like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @afeezorobsco-cyber to this issue.

[fortezzalaboratory]

@fortezzalaboratory has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please Maintainer can i work on this?, I would do a great job.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @fortezzalaboratory to this issue.

[drips-wave]

Congratulations, @fortezzalaboratory! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @fortezzalaboratory: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @fortezzalaboratory as part of the Stellar Wave Program's 6th Wave 🥳

😎 @fortezzalaboratory: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.