Calls Action.onSettled on null responses

[m-canton]

It calls Action.onSettled on any response is needed to clear states changed by Action.onSubmit or before. Only redirects are excluded.

For example, it allows to close form dialogs on action completed.

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[ryansolid]

Fixed on next in e1c1ec4. Every invocation now settles its hooks exactly once — void mutations, metadata-only responses, and redirects included. We went one further than proposed: redirects also fire onSettled, so the contract is simply "one onSettled per invocation, no exceptions" (skipping it on redirect risks leaving stale onSubmit state — like an open dialog — sitting over the new page, since a navigation doesn't necessarily unmount UI rendered above the route tree).

The submissions book-keeping is unchanged and intentional: only outcomes with a result or an error enter the list, so the typical void mutation still leaves nothing behind for you to clear.