fix(list): hide divider on final inset item

[rdlabo]

Summary

• exclude the final ion-item in an inset ion-item-group from the MD3 divider rule
• keep single-item groups divider-free
• preserve dividers between items in multi-item groups
• align the behavior with the ios26 theme

Verification

• npm run lint
• npm run build
• confirmed the compiled selector includes :not(:last-of-type)

[github-actions]

📊 Ionic 9 Playwright Test Report

View the detailed Ionic 9 report: https://rdlabo-dev.github.io/ionic-theme-md3/pr-23/

Ionic 8 runs against the same screenshots in a separate matrix job. View both results in the workflow run.

[rdlabo]

/update-screenshots

[github-actions]

✅ Screenshots have been updated successfully!

The new screenshots have been committed to this PR.

[github-actions]

Playwright test results

 78 passed

Details

 78 tests across 1 suite
 1 minute, 34 seconds
 c36d798
 This detailed result covers Ionic 9 only. Ionic 8 runs against the same screenshots in a separate matrix job; check the workflow run for both results. To update the screenshots, comment with /update-screenshots.

[github-actions]

📊 Ionic 9 Playwright Test Report

View the detailed Ionic 9 report: https://rdlabo-dev.github.io/ionic-theme-md3/pr-23/

Ionic 8 runs against the same screenshots in a separate matrix job. View both results in the workflow run.