feat(components): add reusable ModalDialog component

[markcrivera]

Summary

Adds a reusable ModalDialog component so confirmation and text input flows stop relying on native window.prompt and window.confirm dialogs. This also gives the app a single dialog to consolidate the hand-rolled Headless UI dialogs in components like CompanyBoundaries, UserAdmin, and Export over time.

Changes

• components/ModalDialog.vue, a Headless UI Dialog wrapper with:
  • title, optional message, and a default slot for custom content
  • confirm and cancel events with configurable button labels
  • optional text input (showInput, initialValue, placeholder) that focuses on open and confirms on enter
  • warning variant with a warning icon and red confirm button for destructive actions
  • busy state that disables the confirm button and shows busyText while an async action runs
  • light and dark theme styles consistent with existing components

No existing components are converted in this PR.

Testing

• Verified the input prefilled initial value, focus on open, enter and button both confirm, cancel leaves data untouched.
• Verified the warning: busy label shows while the request runs and the confirm button is disabled until it settles.
• Verified light and dark themes.

Related

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[kevjablonski]

Looks good, approved!