refactor: use const for un-reassigned variables #677

[kumar-ayan]

Description

Refactored several variable declarations from let to const across the codebase in files where variables are read but never reassigned. This aligns with the ESLint prefer-const rule to enforce immutability.

The following files were updated:

• recalculate-all-points.ts (updated projectCount)
• UserProfile.tsx (updated docRef and snap in the document fetch loop)
• InteractiveBackground.tsx (updated logoAngle)

Fixes #677

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Ran npm run lint locally on the modified files to verify the prefer-const warnings were successfully resolved.

• Local testing

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 errors
• I have checked that the "DevPath India" branding remains intact

[kumar-ayan]

Hey @devpathindcommunity-india,

The lint check failure is not caused by these changes. The ESLint errors (~306) are pre-existing issues in the codebase (mainly any type violations in src/types/three.d.ts, setState calls in effects, and unused variables).

This PR only modifies 3 lines to convert let → const, which are valid prefer-const fixes and don't introduce any new lint violations.

[Aditya948351]

Great work. Merging it!