Multiple mini tickets done

[Nathnael45]

Title: Last minute fixes: login flow, signup validation, funds list counts

Body:

Summary

• Login flow: app launch now redirects to /login; added /login page route
• Signup validation: per-field "required field" red text + Toast popup when fields are empty on any step
• Funds list view: fixed response parsing so contributor count and units display correctly (was reading data.funds object instead of data.funds.funds array) — applied to both list and grid view

Test plan

• Go to http://localhost:3000 — should redirect to /login
• Try signing up with empty fields — should show red "required field" under each empty input and a Toast popup
• Go to /funds in list view — contributors and units should show real numbers
• Go to /funds in grid view — same fix applied to card view