feat:150- Implement JWT authentication flow on frontend

[tusharshah21]

Create JWT storage utility for token management (localStorage)

• Implement useLogin hook for SIWE signature + JWT token request
• Add useAuthHeader hook for token refresh and header management
• Create enhanced fetch wrapper with JWT and 401 auto-retry support
• Add LoginButton component (Sign In/Logout) in header next to ConnectButton
• Update profile hooks to support JWT with SIWE fallback:
  • useCreateProfile
  • useUpdateProfile
  • useDeleteProfile

Features:

• Users can sign once with SIWE message to get JWT token
• Token automatically included in all protected API requests
• No need to sign every request anymore
• On 401, automatically refreshes token and retries request
• Token persists across page reloads
• Graceful fallback to SIWE signature auth if no token

Closes #150

[joelamouche]

Overall looks great, but where is the logic for token expiration (defaults to 86400 in our backend)? Yu should probably store date in localstorage and use it to see if token expired

[tusharshah21]

Thanks for the feedback! Both issues addressed:

1. Token Expiration: Now storing expiration timestamp (defaults to 86400s) in localStorage. isTokenValid() checks expiration and auto-clears expired tokens.
2. Unused fetchWithJWT: Removed - wasn't being used. Profile hooks use simpler direct fetch with conditional JWT/SIWE headers.

[joelamouche]

Nice progress!
But there is still some work in order to provide a clean Log In UX and completely replace siwe with jwt

[tusharshah21]

All profile CRUD operations now:

• Auto-trigger login when token is missing/expired
• Use JWT-only (no signature prompts in dialogs)
• Handle authentication transparently in hooks

Removed all SIWE signing UI from Create/Edit/Delete dialogs. Users now sign once on login, then all operations use the JWT token seamlessly.

[joelamouche]

Okay looks great! 🚀

[joelamouche]

🚀 🌔