Update documentation for stacked dialogs

[sbishel]

Summary

Changes:
This PR adds comprehensive documentation for the new stacked dialogs feature (Mattermost v11.10+) to the interactive dialogs plugin guide.

What's new:

• Stacked dialogs overview: Introduced at the top of the doc explaining that dialogs can now be nested up to 3 levels deep
• New action_button element type: Full documentation for the button that opens child dialogs without submitting the parent
  • Includes JSON schema with display_name, name, type, and action_button config
  • Documents the url and optional context fields for button configuration
• Action button flow: Detailed explanation of how the feature works:
  • What happens when a user clicks the button
  • The PostActionIntegrationRequest payload structure
  • How integrations open child dialogs using the returned trigger_id
• Limits & warnings: Clear note that up to 3 dialogs can be stacked; beyond that is silently ignored
• Breaking change note: Documents the v11.10 behavior change where team_id is now server-derived from the channel rather than client-supplied (affecting /submit, /lookup, and /execute endpoints)

Related

Product PR:

Ticket Link

Fixes: https://mattermost.atlassian.net/browse/MM-69219

[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA 4c0f26e

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 77217a0e-7a0e-4301-bc9d-fd338f786698

📥 Commits

Reviewing files that changed from the base of the PR and between 2bf7bd6 and 8ed4418.

📒 Files selected for processing (1)

• site/content/integrate/plugins/interactive-dialogs/_index.md

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📝 Walkthrough

Walkthrough

Interactive dialog documentation now covers v11.10 stacked dialogs through action_button, including the three-dialog limit and execution flow. It also documents channel-derived team_id values for dialog endpoints, including DM/GM behaviour.

Changes

Interactive Dialogs Documentation

Layer / File(s)	Summary
Stacked dialogs and action_button element site/content/integrate/plugins/interactive-dialogs/_index.md	Documents the v11.10 action_button element, its schema, execute/open flow, new trigger ID, three-dialog limit, and updated file element version.
team_id channel-derived behaviour site/content/integrate/plugins/interactive-dialogs/_index.md	Updates team_id documentation to state that the server derives it from the dialog channel, ignores client-supplied values, and uses an empty string for DM/GM channels.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• mattermost/mattermost-developer-documentation#1498: Updates interactive dialog endpoint payload documentation, including intersecting team_id semantics.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: documentation updates for stacked dialogs.
Description check	✅ Passed	The description accurately summarizes the documentation changes for stacked dialogs and the team_id behaviour change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch interactive-dialog-stacked

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@site/content/integrate/plugins/interactive-dialogs/_index.md`:
- Line 628: The heading under the `### Action button elements` section skips a
level and breaks the document hierarchy. Update the `Minimum Server Version:
11.10` heading in the interactive dialogs content to use the next proper heading
level, keeping the section structure consistent with markdownlint MD001.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6ac9addc-edbb-4064-9b11-5ebf571c903c

📥 Commits

Reviewing files that changed from the base of the PR and between dca0a0a and 4c0f26e.

📒 Files selected for processing (1)

• site/content/integrate/plugins/interactive-dialogs/_index.md

[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA d647d75

[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA 8a703d4

[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA 8ed4418