Merge Core main into sameh/core-vue

railCardBlocks.js is the Vue wrapper on this branch, so main's verbatim
legend units move into RailCardBlocks.vue.

changelog.d/1446-draw-area-units.md

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+- Show a drawn area of 9,999.5 m² or more as 1.0 ha, and of 999,500 m² or
+  more as 1.00 km². The draw hint picked the unit before rounding, so it read
+  "10000 m²" and "100.0 ha" (Aditya, @Rohilalala, #1446).

changelog.d/1491-gnss-source-window.md

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+- Let a GNSS integrity source set the layer's evidence window (`windowMs`). A
+  missing or invalid value keeps the 30-minute default, and the layer row now
+  names the window in use instead of a fixed "30 min" (samehkhamis, #1491).

changelog.d/1494-weather-product-display.md

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+- Let a weather source describe its own products through an optional
+  `display` object in each manifest (source, credit, units, coverage, info,
+  legend and extent). Each valid field replaces the built-in value, and
+  manifests without it render as before (samehkhamis, #1494).