## Description
After a successful super admin login, redirect to the super admin
dashboard (`super_admin_root_path`) instead of the users list. The
dashboard is a lighter, overview-first landing page, while the users
index does an exact count over the full users table on every load and
can be slow on large instances.
This only changes the post-login landing page. The users list is still
reachable from the navigation.
Fixes https://linear.app/chatwoot/issue/CW-7928
## Type of change
- [x] Bug fix (non-breaking change which fixes an issue)
## How Has This Been Tested?
Added request specs for `SuperAdmin::Devise::SessionsController#create`:
- successful login redirects to `super_admin_root_path`
- invalid credentials redirect back to the login page
`bundle exec rspec
spec/controllers/super_admin/devise/sessions_controller_spec.rb` -> 3
examples, 0 failures.
## Checklist:
- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
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