Fix issues found by assistants for M3 #330
Description
M3 feedback:
-On the login page, users should receive feedback explaining why the "Continue" button is disabled for invalid emails.
-In the account confirmation flow, returning to the confirmation page after verifying an email doesn't allow access to the "User Info" section, and the "Resend Email" feature fails, necessitating a restart.
-Additionally, in the search functionality, after searching for an association, returning to the "Explore" page, and clicking "Search" again shows previous results even when the search bar is empty.
-Offline mode is robust, but saving account modifications offline triggers a confusing toast message ("deleted user offline"), and occasionally redirects to an unexpected page.