Demonstrate treeview in relation formwidget

[damsfx]

Related :

• Added expand/collapse functionalities to relationship formwidget winter#1374
• Update relation formwidget with availables options docs#243

Summary by CodeRabbit

• New Features
  • Added two new field options for displaying related items in a hierarchical tree view with quick selection and action capabilities.

[coderabbitai]

Walkthrough

Two new relation field definitions were added to the channel model configuration: related_treeview and related_custom_treeview. Both enable tree display capabilities with quickselect and quickTreeActions, with the second using a custom title attribute instead of the standard title for display.

Changes

Cohort / File(s)	Summary
New Relation Fields models/channel/fields.yaml	Added two tree-enabled relation field definitions: related_treeview (using select: title) and related_custom_treeview (using nameFrom: custom_title). Both support quickselect, displayTree, and quickTreeActions properties.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a demonstration of treeview functionality in a relation formwidget, which matches the actual changes of adding two new tree-enabled relation fields.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@models/channel/fields.yaml`:
- Around line 22-40: The relation field definitions related_treeview and
related_custom_treeview use non-standard options (displayTree, quickTreeActions,
quickselect) which Winter CMS ignores; remove those options from these field
entries and enable tree rendering by configuring showTree: true in the
relation's form config (not as field-level options), replace quickTreeActions
with toolbarButtons for any tree action buttons, and if you need custom tree
behavior beyond showTree/toolbarButtons implement it in a plugin or custom
formwidget rather than adding unrecognized options to related_treeview or
related_custom_treeview.