Added back errors panel (#1384)

## Launch Checklist

This PR adds back the error panel which was under the map for some
reason.
It also highlights problematic layers in the layers list (which already
worked).
It also highlights the field that has an error related to it.
It fixes the error types throughout the code.

Before:
<img width="1141" height="665" alt="image"
src="https://github.com/user-attachments/assets/c0593d6c-8f14-41b3-8a51-bc359446656d"
/>


After:
<img width="1141" height="665" alt="image"
src="https://github.com/user-attachments/assets/1ffeebb7-31ea-4ed5-97f4-fc5f907a6aea"
/>


 - [x] Briefly describe the changes in this PR.
- [x] Include before/after visuals or gifs if this PR includes visual
changes.
 - [x] Write tests for all new functionality.
 - [x] Add an entry to `CHANGELOG.md` under the `## main` section.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/components/LayerEditor.tsx

@@ -22,7 +22,7 @@ import {formatLayerId} from "../libs/format";
 import { type WithTranslation, withTranslation } from "react-i18next";
 import { type TFunction } from "i18next";
 import { NON_SOURCE_LAYERS } from "../libs/non-source-layers";
-import { type OnMoveLayerCallback } from "../libs/definitions";
+import { type MappedError, type MappedLayerErrors, type OnMoveLayerCallback } from "../libs/definitions";
 
 type MaputnikLayoutGroup = {
   id: string;
@@ -128,7 +128,7 @@ type LayerEditorInternalProps = {
   isFirstLayer?: boolean
   isLastLayer?: boolean
   layerIndex: number
-  errors?: any[]
+  errors?: MappedError[]
 } & WithTranslation;
 
 type LayerEditorState = {
@@ -193,7 +193,7 @@ class LayerEditorInternal extends React.Component<LayerEditorInternalProps, Laye
     }
     const {errors, layerIndex} = this.props;
 
-    const errorData: {[key in LayerSpecification as string]: {message: string}} = {};
+    const errorData: MappedLayerErrors = {};
     errors!.forEach(error => {
       if (
         error.parsed &&