[photo & carto] Définition explicite de l'ordre des couches fix #67

[vsasyan-ignf]

No description provided.

[Copilot]

Pull request overview

This PR implements explicit layer ordering to fix issue #67 by assigning zIndex values to different layer types in the mapping application. The changes ensure that raster layers, context vector layers, display vector layers, and the pin layer are properly stacked visually.

Changes:

• Added explicit zIndex values to WMTS/raster layers (zIndex: 0) in both initial creation and dynamic updates
• Implemented proper layer insertion logic using insertAt to maintain correct layer order when adding new WMTS layers
• Set zIndex values for all vector layer types: context layers (100), display layers (300), and pin layer (999)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
app/src/components/composable/getWMTS.js	Added zIndex: 0 to raster layers and changed layer insertion from addLayer to insertAt with correct positioning logic
app/src/components/MapBox.vue	Added comments explaining layer types and implemented zIndex assignment for all vector layers during map initialization

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