BA-075 — Add end-to-end learner submission journey coverage

[MaryammAli]

• Type: Test
• Affected area: src/integration/learner-journey.spec.ts
• BackendAcademy
• Summary: The critical path from enrollment through submission, review, progress, reward, and certificate needs a stable regression suite.
• Acceptance criteria: Happy path, retry path, unauthorized path, and partial-failure path run in CI with isolated fixtures.

[tobemacauley-rgb]

@tobemacauley-rgb has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I would love to resolve this issue and give it a high quality PR

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[judithJn]

@judithJn has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, Please can i work on this

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[drips-wave]

Congratulations, @judithJn! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@judithJn's PR #719 was approved and merged by @MaryammAli.

🏆 @judithJn: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (284 total points). Track your full progress on GrantFox.

👏 Great work, @judithJn! Keep contributing to BlockDash-Studios.

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This issue has been completed by @judithJn as part of the Stellar Wave Program's 8th Wave 🥳

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