Replace window.confirm calls with confirmation modals

[koki-star]

Description

Fixes #1093

Author:

• @koki-star

This replaces the seven remaining window.confirm calls with OED's existing ConfirmActionModalComponent. The changes cover group area calculations, group child compatibility warnings, meter displayable warnings, map deletion, and large raw-data exports.

The existing confirmation behavior, toast notifications, permissions, size checks, and download logic are preserved. The confirmation messages and buttons were also updated and translated where needed.

Testing completed:

• Manually tested the Cancel and confirmation actions
• npm run check
• Docker test suite: 942 passing, 0 failing, and 1 pending

Type of change

• Note merging this changes the database configuration.
• This change requires a documentation update

Checklist

• I have followed the [OED pull request](https://openenergydashboard.org/developer/pr/) ideas
• I have removed text in ( ) from the issue request
• You acknowledge that every person contributing to this work has signed the [OED Contributing License Agreement](https://openenergydashboard.org/developer/cla/) and each author is listed in the Description section.

Limitations

None.

Screenshots

I tested all seven confirmation popups. Click each one to view the screenshot.

1. Create Group area

2. Edit Group area

3. Group compatibility warning

4. Meter display warning

5. Delete Map

6. Export size warning

7. Admin export limit