Kyledoliente update docs interactive dialog

[krd311]

Summary

Adds in documentation and instructions regarding the new collapsible elements in interactive dialogs.

Ticket Link

https://mattermost.atlassian.net/browse/MM-69315

[Copilot]

Pull request overview

Adds developer documentation for the new collapsible interactive dialog element so plugin/integration authors can structure long forms into nested, toggleable sections.

Changes:

• Adds collapsible to the supported interactive dialog element type list.
• Introduces a new “Collapsible elements” section with behavior description, JSON example, and a supported-fields table.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cb399a08-1fff-4a31-8dd2-3a71590e2d74

📥 Commits

Reviewing files that changed from the base of the PR and between ad16332 and 49fed61.

📒 Files selected for processing (1)

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

📝 Walkthrough

Walkthrough

This PR updates the interactive dialogs documentation to introduce a new collapsible element type, adding it to the elements overview list and documenting its rendering behavior, submission semantics, nesting limits, and supported fields.

Changes

Collapsible Element Documentation

Layer / File(s)	Summary
Elements list update site/content/integrate/plugins/interactive-dialogs/_index.md	Adds collapsible to the "Elements" bullet list of supported dialog element types.
Collapsible elements section site/content/integrate/plugins/interactive-dialogs/_index.md	Adds a new "Collapsible elements" subsection covering minimum server version (11.10.0), collapsed/borderless rendering options, submission behaviour (children only), nesting limit of 3 levels, a JSON example, and a field reference table.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is related to the doc update, but it is awkward and doesn’t mention the new collapsible dialog element specifically.
Description check	✅ Passed	The description clearly matches the PR, describing documentation updates for collapsible interactive dialog elements.
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

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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 626: The heading in the interactive dialogs markdown section is using a
level that skips from the surrounding `###` structure, so update the “Minimum
Server Version” heading to use the consistent `####` level in the same section.
Keep the change localized to the markdown heading text so the hierarchy remains
uniform and markdownlint-compliant.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

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

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7a0c552f-d4e8-4198-b9d6-ce1fde5f799f

📥 Commits

Reviewing files that changed from the base of the PR and between bc6cb37 and ad16332.

📒 Files selected for processing (1)

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