Small logic cleanups (#3449)

* Small logic cleanups

* Small logic cleanups (#3451)

* remove a few things

* oops

* stop swallowing the error

* queue callbacks

* oops

* log error if caught

* no need to be nullable

* move isClosing=true up

* reset `isClosing` and `closeCallbacks` on close completion and open

* run queued callbacks on `open` if there are any pending

* rm unnecessary ref and check

* ensure order of calls is always correct

* call `snapToIndex()` on open

* add tester to storybook

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Co-authored-by: Hailey <me@haileyok.com>

src/view/com/composer/Composer.tsx

@@ -507,9 +507,7 @@ export const ComposePost = observer(function ComposePost({
         control={discardPromptControl}
         title={_(msg`Discard draft?`)}
         description={_(msg`Are you sure you'd like to discard this draft?`)}
-        onConfirm={() => {
-          discardPromptControl.close(onClose)
-        }}
+        onConfirm={onClose}
         confirmButtonCta={_(msg`Discard`)}
         confirmButtonColor="negative"
       />