Description

Fixed malformed JSX in frontend/src/components/admin/AdminHome.jsx that broke the frontend build. The dashboard navigation had a duplicated/incomplete <nav> block — the "Activity Logs" button was missing its opening <Button tag and was merged incorrectly with a second <nav> element, splitting what should be a single three-way conditional (Users / Payments / Activity Logs) into two broken conditional blocks.

Merged into a single <nav> with all three buttons properly structured, and combined the conditionals into one clean three-way check (payments → activity-logs → default users).

Closes #22

Build Verification

Ran npm run dev in the frontend folder after the fix — Vite starts cleanly with no errors, confirming the build issue is resolved.

## Type of Change * [x] 🐛 Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings or console errors.
• I have tested my changes locally and verified they work as expected.
• Any dependent changes have been merged and published in downstream modules.

Build issue addressed as expected. LGTM, approving.