fix: recreate channels on load

[kptdobe]

If the app reloads or "navigates" (internal navigation), the SDK fails to load:

shell.js:85 Uncaught DataCloneError: Failed to execute 'postMessage' on 'Window': Port at index 0 is already neutered.


The ports are neutered and needs to be recreated.
There is no reason to have a global variable anyway.

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Commits

• 82d8a5f ✅ (latest)