Fix caret CSS in collapse, Menu and Tree items

[Kavin-Trimble]

📄 Summary of Changes

Fix caret CSS in collapse, Menu and Tree items
Fix side nav visiblity of caret

💭 Type of Change

• Bug fix (fixes an issue)
• New feature (adds functionality)
• Configuration change (modifies scaling or properties of existing infrastructure & services)
• Documentation change
• Other

📋 Test Plan

✅ Self Code Review Checklist

PR authors and reviewers, please verify that all of these items have been completed.

• My code is clean and readable
• I followed standard conventions
• Component code is WCAG 2.2 compliant (if applicable)
• I have made theme files changes (if applicable)
• I have made documentation changes (if applicable)
• I have made Storybook changes including usage documentation (if applicable)
• I have tested the component thoroughly in Storybook including RTL rendering (if applicable)

🔗 Work Item

Issue #1309

[github-actions]

🚀 Storybook Preview

Preview is available at: https://trimble-oss.github.io/modus-wc-2.0/pr-preview/pr-1333/

[Copilot]

Pull request overview

This PR updates caret/chevron styling across Collapse, Menu Item, and Tree Item to replace DaisyUI’s box-shadow-based caret with a consistent equal-stroke chevron, and adjusts Side Navigation behavior so the submenu caret is hidden when the rail is collapsed (where submenu expansion is blocked).

Changes:

• Replace DaisyUI box-shadow caret rendering with border-based “equal-stroke” chevrons for menu and tree item dropdown toggles.
• Refactor Collapse chevron styling via a shared SCSS mixin and ensure open/closed rotation states remain correct for left/right chevrons.
• Hide submenu caret in collapsed side navigation rail to avoid clipping and reflect the non-expandable state.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/components/modus-wc-tree-item/modus-wc-tree-item.scss	Overrides dropdown caret styling to use border strokes (no box-shadow) while preserving DaisyUI sizing/rotation behavior.
src/components/modus-wc-side-navigation/modus-wc-side-navigation.scss	Hides submenu caret when side nav is collapsed to prevent clipping and match blocked expansion behavior.
src/components/modus-wc-menu-item/modus-wc-menu-item.scss	Updates dropdown toggle caret styling to border-based chevron for consistent appearance.
src/components/modus-wc-collapse/modus-wc-collapse.scss	Introduces a mixin to standardize chevron stroke rendering and applies it to left/right collapse arrows with correct open-state rotation.

[github-actions]

🚀 Blazor Story Preview

Preview is available at: https://trimble-oss.github.io/modus-wc-2.0/pr-preview/pr-1333/blazor/

[ElishaSamPeterPrabhu]

The alignment is off even with the new approach:

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[Kavin-Trimble]

The alignment is off even with the new approach:

@ElishaSamPeterPrabhu
Now I have reverted our before/after implementations to use the same box shadow instead of the border as DaisyUI. But still, the legs are looking different lengths.
And I have tried some workarounds to match their sizes by modifying the height/width, and it is not the right way, as the height and width are supposed to be the same for the geometrical representation.
Could you take a look and suggest a way if you have any, or can we go with icons for this?

[ElishaSamPeterPrabhu]

The alignment is off even with the new approach:

@ElishaSamPeterPrabhu Now I have reverted our before/after implementations to use the same box shadow instead of the border as DaisyUI. But still, the legs are looking different lengths. And I have tried some workarounds to match their sizes by modifying the height/width, and it is not the right way, as the height and width are supposed to be the same for the geometrical representation. Could you take a look and suggest a way if you have any, or can we go with icons for this?

As discussed and decided offline, let's go with the png approach.