fix: mirror Expand layout in Collapse split-button group

[R-Hart80]

Problem

Closes #208.

The Collapse split-button group had the opposite layout from the Expand group:

Group	Left (main, labeled)	Right (icon-only)
Expand (before & after)	ChevronDown → expand one level	ChevronsDown → expand all
Collapse (before)	ChevronsRight → collapse all	ChevronRight → collapse one level
Collapse (after)	ChevronRight → collapse one level	ChevronsRight → collapse all

A user who learned "labeled button = conservative one-step action" from the Expand group would accidentally collapse the entire tree on first click of Collapse.

Fix

Swapped the onClick handlers, icons, and aria-label attributes in the Collapse group so both split-button clusters follow the same convention: labeled main button = one step, icon-only add-on = all levels.

Testing

• Clicking Collapse (labeled) collapses one level only
• Clicking the double-caret add-on collapses all levels
• aria-label on each button matches its action
• No regressions in existing test suite (158/159 pass; 1 pre-existing failure in LanguagePicker.test.tsx unrelated to this change)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Reordered collapse buttons in the editor toolbar for improved clarity.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9b8b6ed7-4bef-49b0-88a9-39ea35f60453

📥 Commits

Reviewing files that changed from the base of the PR and between 0233a83 and f02a0b0.

📒 Files selected for processing (1)

• components/editor/shared/EntityTreeToolbar.tsx

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📝 Walkthrough

Walkthrough

The Collapse split-button group in the entity tree toolbar is reordered to align with the Expand group's layout: the left labeled button now performs the conservative one-level action, and the right icon-only button performs the all-levels action.

Changes

Collapse Split-Button Layout Alignment

Layer / File(s)	Summary
Collapse Split-Button Group Reordering components/editor/shared/EntityTreeToolbar.tsx	Left button swapped from onCollapseAll + ChevronsRight + "Collapse all" to onCollapseOneLevel + ChevronRight + "Collapse one level"; right button swapped from onCollapseOneLevel + ChevronRight + "Collapse one level" to onCollapseAll + ChevronsRight + "Collapse all".

🎯 1 (Trivial) | ⏱️ ~3 minutes

🐰 A button swap so neat and precise,
Left for one step, right for splice,
Now Collapse matches Expand's design,
Icons and actions in perfect align! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

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.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: reordering the Collapse split-button group to mirror the Expand group's layout.
Linked Issues check	✅ Passed	All done criteria from issue #208 are met: labeled Collapse button now collapses one level [#208], right add-on collapses all levels [#208], aria-labels updated to match new actions [#208], and the layout now mirrors the Expand group [#208].
Out of Scope Changes check	✅ Passed	The PR changes only the Collapse split-button group's order, icons, handlers, and aria-labels in EntityTreeToolbar.tsx, which is directly in scope per issue #208. No icon direction change (e.g., to up-carets) or unrelated modifications are present.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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