ref: do not allow uncontrolled compactSelect

[TkDodo]

defaultValue is used for uncontrolled components - those that do not have an onChange handler. You usually either pass defaultValue (fully uncontrolled), or you pass value + onChange (fully controlled)

uncontrolled only makes sense in forms where you take the “html” value from the form submit handler, which is not something we do right now. All usages except one in production are controlled usages.

The one usage in gsApp/views/subscriptionPage/usageLog.tsx passes a defaultValue decoded from the url and has an onChange handler that navigates. This will work just the same when passing value. Actually using nuqs would make this explicit.

Note: This is a preparation for a larger refactoring / perf improvement of compactSelect to avoid rendering all options eagerly.