fix: update tree pattern expand icon direction

[mcoker]

fixes #12553

Updates the following tree patterns to use the right/down arrows instead of down/up

• Tree view
• Dual list selector tree view
• Tree table

Summary by CodeRabbit

• Bug Fixes
  • Fixed expand/collapse toggle indicators to use the correct right-facing caret icon across Tree View, Dual List Selector tree items, and table tree rows.
• Style
  • Updated PatternFly styling components to a newer prerelease version to keep UI visuals aligned with the latest updates.

[coderabbitai]

Walkthrough

Updates five PatternFly package references to 6.6.0-prerelease.18 and changes tree expand/collapse toggle icons from caret-down to caret-right in TreeView, DualListSelector, and table tree rows.

Changes

Tree caret and PatternFly updates

Layer / File(s)	Summary
PatternFly prerelease dependency alignment packages/react-core/package.json, packages/react-docs/package.json, packages/react-icons/package.json, packages/react-styles/package.json, packages/react-tokens/package.json	Pins @patternfly/patternfly dependencies or devDependencies to 6.6.0-prerelease.18.
Tree toggle caret updates packages/react-core/src/components/{TreeView,DualListSelector}/*, packages/react-table/src/components/Table/utils/decorators/treeRow.tsx	Replaces rendered caret-down toggle icons with RhMicronsCaretRightIcon and updates the corresponding imports.

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

Possibly related PRs

• patternfly/patternfly-react#12298: Changes caret icon imports and usages in overlapping tree components.
• patternfly/patternfly-react#12496: Updates DualListSelector-related controls to use the microns caret-right icon.
• patternfly/patternfly-react#12526: Updates overlapping PatternFly package manifests to prerelease versions.

Suggested reviewers: kmcfaul, nicolethoen, wise-king-sullyman

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR updates treeview-related caret icons from down to right, matching the linked issue's requested expand icon change.
Out of Scope Changes check	✅ Passed	The dependency bumps and icon swaps are coherent with the tree icon update and do not show unrelated scope creep.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main change: updating tree expand icon direction in the tree components.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[patternfly-build]

Preview: https://pf-react-pr-12554.surge.sh

A11y report: https://pf-react-pr-12554-a11y.surge.sh

[thatblindgeye]

Actually, should we also update where wew're using a tree view outside the actual component, like the DualListSelector with tree implementation?

[mcoker]

@thatblindgeye nice catch. Confirmed with design, all tree patterns should be updated. Updated the PR so it changes:

• Tree view
• Dual list selector tree view
• Tree table

Need to merge the CSS change from patternfly/patternfly#8502 for this PR to look right, since that changes the rotation from 180deg to 90deg.