feat: Implement magic link authentication

This commit introduces a new magic link authentication flow.
The desktop client can now request a temporary, one-time-use token from
the server.
This token is then used to open a URL in the system browser, which
redirects to the server.
The server consumes the token, installs a regular web session, and
redirects the user

server/src/main.rs

@@ -160,6 +160,7 @@ async fn main() {
         transcribe_tx,
         analyze_tx,
         session_store: doctate_server::web_session::new_store(),
+        magic_link_store: doctate_server::magic_link::new_store(),
         analyze_busy: doctate_server::AnalyzeBusy(analyze_busy),
         transcribe_busy: doctate_server::TranscribeBusy(transcribe_busy),
     };