fix(shared-internals): clear disconnectingPromise after a failed disconnect

[cpruijsen]

Summary

disconnectInternal() clears disconnectingPromise in a finally so a rejected disconnect() no longer leaves ConnectionManager unable to disconnect or connect again. The next call starts a new teardown instead of returning the same cached rejection (#1097). Concurrent in-flight disconnect() calls still share one promise and the same rejection; only a later call retries.

disconnectInternal() is also on the connect() path, and disconnectAndClear() disconnects first, so one teardown failure previously blocked reconnect and clear for the life of the instance.

try/finally wraps the existing await of disconnectingPromise, matching ControlledExecutor.execute() in this package (clear the in-flight field in finally whether the task fulfills or rejects). The try/finally form is the patch specified and verified in #1097. An alternative is this.disconnectingPromise = this.performDisconnect().finally(() => { this.disconnectingPromise = null }).

performDisconnect() is unchanged: it still does not dispose() after disconnect() throws. Members are already nulled before those awaits, so a retry is a no-op rather than a double-dispose.

Test plan

• pnpm exec vitest run tests/client/ConnectionManager.test.ts in packages/shared-internals. New tests fail without the finally, pass with it
• pnpm exec vitest run in packages/shared-internals (59 tests)
• Changeset included for @powersync/shared-internals (patch)

Closes #1097

[changeset-bot]

🦋 Changeset detected

Latest commit: a1c2a7f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
@powersync/shared-internals	Patch
@powersync/adapter-sql-js	Patch
@powersync/capacitor	Patch
@powersync/node	Patch
@powersync/react-native	Patch
@powersync/web	Patch
@powersync/diagnostics-app	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR