Update from code changes: document Slack channel message trigger

[mintlify]

Summary

Documents the new Slack channel message trigger for custom automations. When enabled, an automation runs whenever someone posts a new top-level message in a selected Slack channel, and the agent replies in the triggering thread with a summary and any pull request link.

Changes

• Added Slack channel message to the trigger types list in the Automations overview.
• Added Slack channel message to the trigger configuration options in Manage automations, including channel selection, the "invite the app to each channel" requirement (dashboard blocks saving otherwise), how Mintlify filters and dedupes messages, and that run detail shows the triggering message with a Slack permalink.
• Mirrored all changes into Spanish, French, and Chinese.

Update history

• Initial run: documented the server-side trigger surfaced in https://github.com/mintlify/server/pull/7548 across automations/index.mdx and automations/manage.mdx.
• Follow-up run: mirrored the trigger content to es/, fr/, zh/ and split one long English sentence.
• Follow-up run: covered the dashboard-side setup (channel picker requires the Slack app to be a member of each channel) and the triggering-message permalink shown on run detail, from https://github.com/mintlify/mint/pull/10194.

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[mintlify]

Update from code changes updated this PR.

No changes made this update

Source PRs

• mintlify/mint#10194 — Add Slack channel message trigger for automations