style: enforce prefer-const rules in profile, scripts, and background components

[kumar-ayan]

Describe the changes
Refactored several variable declarations from let to const in files where variables are read but never reassigned. This aligns with the ESLint prefer-const rule to ensure immutability is clearly declared.

To Reproduce/Files Modified:
The following files were modified to replace let with const for unused reassignments:

1. scripts/recalculate-all-points.ts

   • Changed let projectCount = projectsSnap.size; to const projectCount = projectsSnap.size;

2. src/components/profile/UserProfile.tsx

   • Changed let docRef and let snap to const docRef and const snap during the asynchronous user document fetch loop.

3. src/components/ui/InteractiveBackground.tsx

   • Changed let logoAngle = 0; to const logoAngle = 0; in the interactive background animation loop.

Expected behavior
Variables that are never reassigned should use const instead of let to improve code readability, maintainability, and satisfy ESLint's prefer-const rule.

Additional context
These changes were resolved automatically by running npm run lint --fix on the workspace.

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[Aditya948351]

@kumar-ayan Assigned!

[github-actions]

Hi @kumar-ayan! We have officially assigned this issue to you. Please start working on it, and good luck with your PR!

ETA: 3 days
Issue will be assigned to another contributor if failed to do so!

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