Missing error toasts for invalid credentials and duplicate registration #11
Description
When a user attempts to log in with invalid credentials, the application does not display an error toast or any visible error message, the screen remains unchanged and the user receives no feedback.
Similarly, when a user attempts to register with an email that already exists, there is no error toast; the UI does not indicate the duplicate-email error. In both cases the operation fails silently from the user's perspective.
Reproduction steps (concise)
Sign In flow
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Go to /sign-in
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Enter a valid email (or invalid) and an incorrect password.
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Click Sign In.
Observe: the app does not show any toast or error message; the page remains on the login screen with no visible feedback.
Sign Up flow
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Go to /sign-up
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Enter user details using an email that's already registered (same email as existing account).
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Submit the registration form.
Observe: no error toast or user-facing message indicates the duplicate email; form appears to do nothing.