fix: createPortal effect merging stale data from initial render

[notrabs]

Fixes #3253

• Added a missing dependency on the inject function, which caused the effect to update a portal's store with stale data from the initial render
• The store destruction has been moved to a separate hook, so it continues to run only on component unmount

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[notrabs]

Testing locally, I now get the expected sequence of events (using the minimal repro):