Frontend: Add sorting to lists

[Smartdevs17]

Problem

Users cannot sort project/invoice lists.

Proposed Solution

Add column sorting.

Acceptance Criteria

• Sort by date
• Sort by amount
• Sort by status
• Toggle ascending/descending

Technical Notes

• Files: frontend/app/dashboard/projects/page.tsx

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[1sraeliteX]

@1sraeliteX has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I would like to work on this issue because unsortable lists become unusable as data grows. I'll add ascending/descending column sorting by date, amount, and status to the projects and invoices lists in frontend/app/dashboard/projects/page.tsx.
Thanks!

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Congratulations, @1sraeliteX! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @1sraeliteX: 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.

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