[BUG] Errors while running `npm run lint`

[udaykiran243]

Describe the bug

**Description**
Running `npm run lint` or checking `lint_errors_v2.txt` reveals several ESLint errors and warnings that need addressing to ensure code quality and stability.


**Current Issues**
- **Unused Variables:** Multiple components (e.g., `Blog.jsx`, `Features.jsx`, `Login.jsx`) define `motion` but never use it.
- **Unused Hooks:** `useContext` and `useEffect` are imported but unused in `Navbar.jsx`.
- **React Hooks Deps:** `Coin.jsx` has missing dependencies in its `useEffect` array (`fetchCoinData`, `fetchHistoricalData`).
- **Best Practices:** Several context files (`AuthContext.jsx`, `CoinContext.jsx`) trigger "Fast refresh only works when a file only exports components" warnings.

Steps to reproduce

1. Run `npm install`
2. Run `npm run lint`

Expected behavior

Expected Behavior
Running npm run lint should return no errors or warnings.

Affected component

Frontend (React/Vue)

[udaykiran243]

hey @KaranUnique please assign this issue to me under Apertre