fix(integrations): send a single notification when a token refresh fails

[giladresisi]

Problem

Every failed token refresh notifies (in-app + email) the user twice:

1. refreshProcess (refresh.integration.service.ts) calls informAboutRefreshError with the failure cause — email titled Could not refresh your <provider> channel <cause>.
2. It then calls integrationService.disconnectChannel, which internally calls informAboutRefreshError again, without the cause — a second email titled Could not refresh your <provider> channel.

The disconnectChannel call contributes nothing else in this path: the refreshNeeded call two lines earlier already sets the exact same refreshNeeded: true flag that disconnectChannel's repository call sets.

Fix

Remove the disconnectChannel call from refreshProcess's failure branch. The user still gets exactly one notification — the informative one that includes the failure cause — and the channel is still flagged as needing reconnection. disconnectChannel itself is untouched, so its other callers (analytics token-expiry path, public API, chat tool) keep their existing notify-on-disconnect behavior.

Repro & validation

• Repro (before fix): connected an Instagram (Facebook Business) channel holding an invalid access token, then triggered a post. The publish failed with a token error, the refresh attempt failed (Instagram cannot refresh), and two emails arrived for the single failure — one with the cause in the title, one without.
• Validation (after fix): repeated the exact same scenario — exactly one email arrived (the one including the failure cause), and the channel was still marked as needing reconnection (red badge + blocked posting), as expected.

🤖 Generated with Claude Code

[postiz-contribution]

Contribution-checker quality warning
Heuristic score: 12/100 (low). This is a non-blocking warning surfaced by the project's quality settings.

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• Excessive inline code references: 14 inline refs (>3)
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• Commit message too long: Longest: 1098 chars

If this is a genuine contribution, please add detail to your PR description and tighten the diff scope before reviewers look at it.

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