fix: improve snapping demo behavior

[oterral]

How to

To make the snapping experience better we decide to remove the snapping button in the demo .

This PR also fix bugs:

• impossible when drawing a line/polygon to snap on the other points.
• duplicate vetticla lines were badly detected due to too much recise conversion between pixel and coordinates
• update eslint 9

This happens because the modified node was not exclude from snappable points list, the code incriminated was the getShiftedMultipoint method

Others

• It's not a hack or at least an unauthorized hack :).
• The images added are optimized.
• Everything in ticket description has been fixed.
• The author of the MR has made its own review before assigning the reviewer.
• The title is formatted as a conventional-commit message.
• The title contains WIP: if it's necessary.
• Labels applied. if it's a release? a hotfix?
• Tests added.

IMPORTANT: Squash commits before or on merge to prevent every small commit being written into the change log. The Pull Request title will be written as message for the new commit containing the squashed commits and there fore needs to be in conventional-commit format

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Name	Status	Preview	Comments	Updated (UTC)
openlayers-editor	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2024 7:45am