Bart Louwers 533f647c71 Add duplicate layer id check (#1262) ...

## Summary

<img width="437" alt="Screenshot 2025-07-05 at 00 29 02"
src="https://github.com/user-attachments/assets/ebf8b024-a340-4eac-b470-29fd8f080c0a"
/>

- show an error if a layer with an existing id is added
- keep Add Layer modal open until the id is unique

## Testing
- `npm run lint`
- `npm run build`


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https://chatgpt.com/codex/tasks/task_e_6868498a46188331b16e7b6e120930a7

2025-07-05 11:32:32 +02:00

..

accessibility.cy.ts

Upgrade eslint (#1014)

2025-01-21 15:21:30 +00:00

history.cy.ts

Upgrade eslint (#1014)

2025-01-21 15:21:30 +00:00

i18n.cy.ts

Upgrade eslint (#1014)

2025-01-21 15:21:30 +00:00

keyboard.cy.ts

Upgrade eslint (#1014)

2025-01-21 15:21:30 +00:00

layers.cy.ts

Add precommit check (#1080)

2025-02-25 05:01:15 -05:00

map.cy.ts

Add precommit check (#1080)

2025-02-25 05:01:15 -05:00

maputnik-cypress-helper.ts

Improve drivers (#856)

2024-01-02 12:12:06 +02:00

maputnik-driver.ts

Handle QuotaExceededError in StyleStore (#1253)

2025-07-04 10:27:00 +02:00

modal-driver.ts

Upgrade eslint (#1014)

2025-01-21 15:21:30 +00:00

modals.cy.ts

Add duplicate layer id check (#1262)

2025-07-05 11:32:32 +02:00