Add Remember Me session storage for login

[gTanusri]

Summary

• Added a shared auth storage helper to support both persistent and session-only login.
• Added a Remember Me checkbox on the login page.
• Store auth tokens in localStorage when Remember Me is checked and sessionStorage when unchecked.
• Applied the same storage behavior to Google login.
• Updated protected routes, API interceptors, logout, and websocket notification requests to read and clear auth data from both storage locations.
• Fixed a missing closing brace in ApiService.js that was preventing the frontend build from parsing.

Issue

Closes #242

Validation

• npm run build passes
• ./gradlew.bat compileJava passes
• git diff --check passes

[rdodiya]

Hi @gTanusri,

The current implementation correctly stores authentication data in localStorage when Remember Me is checked and in sessionStorage otherwise.

One additional enhancement is needed:

• If the user selects Remember Me, store the user's email/username in localStorage.
• On subsequent visits to the Login page, automatically pre-populate the email/username input field from localStorage.
• If Remember Me is unchecked, clear the stored email/username so it is not auto-filled on future visits.

This will provide a better user experience while keeping the existing authentication storage behavior unchanged.

[gTanusri]

Hi @rdodiya, I've updated the PR with username pre-fill when Remember Me is checked, and it clears when unchecked.