Add support checkbox render

[groman92]

Adding support to checkboxes.

As shown in Cloud Services onboarding document, checkbox are not being rendered correctly also is stated in syntax.md that TaskList ("Checkbox") are not supported.

https://codex.elastic.dev/r/security-team/security-integrations-team/cloud-services/onboarding
Before

After

[reakaleek]

Thank you for the contribution!

What are your thoughts on local persistence?

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds task list support to the documentation builder. The Markdig .UseTaskLists() extension is integrated into the Markdown parsing pipeline. CSS styling handles task list containers, items, and checkbox inputs. A test class validates that rendered HTML includes correct CSS classes and checkbox attributes. Documentation updates include a new task-lists.md page with syntax examples, removal of task lists from the unsupported features list, and navigation entry in the docset configuration.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Title check	❓ Inconclusive	The title 'Add support checkbox render' is vague and uses unclear phrasing ('checkbox render' lacks specificity), making it difficult to understand the primary change from the title alone.	Revise to a clearer, more specific title such as 'Add task list and checkbox rendering support' to better convey the feature being implemented.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is directly related to the changeset, explaining the motivation (checkboxes not rendering correctly, task lists marked as unsupported) and providing before/after evidence of the fix.
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.

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✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch checkbox_render_fix

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[coderabbitai]

🧹 Nitpick comments (1)

tests/Elastic.Markdown.Tests/TaskList/BasicTaskListTests.cs (1)

17-30: ⚡ Quick win

Rename test methods to Method_Scenario_Expected.

The four new test names don’t follow the required test naming convention, which makes suite consistency/searchability weaker.

As per coding guidelines "tests/**/*.cs: ... Test method naming convention: Method_Scenario_Expected."

🤖 Prompt for 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.

In `@tests/Elastic.Markdown.Tests/TaskList/BasicTaskListTests.cs` around lines 17
- 30, Rename the four test methods to follow Method_Scenario_Expected: change
RendersTaskListContainer to Render_TaskListContainer_ContainsTaskListClass,
RendersTaskListItem to Render_TaskListItem_ContainsTaskListItemClass,
RendersUncheckedCheckbox to Render_UncheckedCheckbox_RendersDisabledInput, and
RendersCheckedCheckbox to Render_CheckedCheckbox_RendersDisabledCheckedInput so
they match the tests/**/*.cs naming convention and improve discoverability
(update all references/usages of these method names if any).

🤖 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.

Nitpick comments:
In `@tests/Elastic.Markdown.Tests/TaskList/BasicTaskListTests.cs`:
- Around line 17-30: Rename the four test methods to follow
Method_Scenario_Expected: change RendersTaskListContainer to
Render_TaskListContainer_ContainsTaskListClass, RendersTaskListItem to
Render_TaskListItem_ContainsTaskListItemClass, RendersUncheckedCheckbox to
Render_UncheckedCheckbox_RendersDisabledInput, and RendersCheckedCheckbox to
Render_CheckedCheckbox_RendersDisabledCheckedInput so they match the
tests/**/*.cs naming convention and improve discoverability (update all
references/usages of these method names if any).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: ae2072da-9ce0-4e59-8b91-66d0d300b3b1

📥 Commits

Reviewing files that changed from the base of the PR and between e729f3e and a1604dd.

📒 Files selected for processing (6)

• docs/_docset.yml
• docs/syntax/index.md
• docs/syntax/task-lists.md
• src/Elastic.Documentation.Site/Assets/markdown/list.css
• src/Elastic.Markdown/Myst/MarkdownParser.cs
• tests/Elastic.Markdown.Tests/TaskList/BasicTaskListTests.cs

💤 Files with no reviewable changes (1)

• docs/syntax/index.md