[ENHANCEMENT] Fix Vite Fast Refresh warnings in Context Providers

[Adithyakp86]

Problem

Vite's Fast Refresh often fails for Context Provider files because they export both the Context and the Provider component. This triggers a lint error: Fast refresh only works when a file only exports components.

Proposal

Separate the context creation and the Provider component into different files.

1. Move createContext calls to dedicated .js files (e.g., AuthContextInstance.js).
2. Keep the Provider component in the .jsx file.
3. Update imports across the app.

Scope

• DX (Developer Experience) / Code readability

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