fix(pds-dropdown-menu): prevent clipping in overflow containers

[pixelflips]

Description

Fixes an issue where pds-dropdown-menu gets clipped when placed inside containers with overflow: hidden (e.g., responsive pds-table).

The fix uses Floating UI's strategy: 'fixed' option instead of the default 'absolute' positioning, which allows the dropdown panel to "break out" of clipping ancestors.

Fixes DSS-89

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• unit tests
• tested manually

Manual Testing:

• Verified dropdown appears correctly in responsive tables (no clipping)
• Verified dropdown still works in normal contexts
• Verified ::part(menu-panel) styling still works
• Verified keyboard navigation still functions

Test Configuration:

• Pine versions: 3.14.0
• OS: macOS
• Browsers: Chrome

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing tests pass locally with my changes

[netlify]

✅ Deploy Preview for pine-design-system ready!

Name	Link
🔨 Latest commit	2625dc6
🔍 Latest deploy log	https://app.netlify.com/projects/pine-design-system/deploys/6973b6697566db00087f8698
😎 Deploy Preview	https://deploy-preview-643--pine-design-system.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.