Pull request template

Motivation and context

BaseModal always sets overflow: hidden on body and html while it is open. Consumers that keep a modal open while it is visually hidden (e.g. an embedded predictive layer with no content) end up with a page that can't be scrolled. There was no way to opt out.

This adds a scrollLock prop (default true, so no behaviour change) to control that lock.

• Dependencies. If any, specify:
• Open issue. If applicable, link:

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that causes existing functionality to not work as expected)
• Change requires a documentation update

What is the destination branch of this PR?

• Main
• Other. Specify:

What changed

• New scrollLock prop on BaseModal (Boolean, default true).
  • true: unchanged behaviour, locks the page scroll while open and restores it on close.
  • false: the modal never touches overflow on body/html.
• The prop can be toggled while the modal is open (releases / re-applies the lock).
• The modal only restores overflow values it set itself, so it no longer overwrites styles set by others when scrollLock is false.
• BaseIdModal / BaseEventsModal forward it via attribute fallthrough (:scroll-lock="false").
• Docs section added to BaseModal.

How has this been tested?

Unit tests in base-modal.spec.ts: default lock + restore, no lock with scrollLock=false, toggling while open, not restoring overflow it didn't set, restore on unmount while open. src/components/modals: 61 tests pass; eslint and vue-tsc clean.

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review on my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.