**Description**
Fixes a race condition in the Seerr integration.
When you added a new Seerr server and logged in successfully, the app
would immediately show the "Disable Seerr?" dialog instead of a success
message. The state was getting mixed up during recomposition and
thinking you wanted to remove the server you just added.
Fixed by being more explicit about what mode the dialog is in (adding vs
removing) so it can't get confused by background state changes. Also
added a success toast when login works.
**AI/LLM usage**
Used Claude Code to analyze the issue.
18e4877736