fix: update session field casts to float32 to match synced API types

[Copilot]

API type sync changed SessionsInactivityTimeout and SessionsTimebox from Nullable[int] to Nullable[float32] in generated types. The handwritten code in auth.go still cast to int, causing a build failure.

• Updated casts in toAuthConfigBody() from int to float32:

// before
body.SessionsTimebox = nullable.NewNullableWithValue(int(s.Timebox.Hours()))
body.SessionsInactivityTimeout = nullable.NewNullableWithValue(int(s.InactivityTimeout.Hours()))

// after
body.SessionsTimebox = nullable.NewNullableWithValue(float32(s.Timebox.Hours()))
body.SessionsInactivityTimeout = nullable.NewNullableWithValue(float32(s.InactivityTimeout.Hours()))

• fromAuthConfig() required no changes — ValOrDefault is generic and infers float32 from the Nullable[float32] field automatically.

Original prompt

Pull Request: #4997

Fixes the build failure from code generation. Run tests and make sure they pass.

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