fix(deps): downgrade @types/ol-ext to resolve type compatibility issues

- Downgrade @types/ol-ext from ^3.6.7 to ^3.6.3 in package.json
- Update package-lock.json to reflect dependency version change
- Resolves type conflicts with current ol-ext implementation

Author: d-koppenhagen

package-lock.json

@@ -210,7 +210,7 @@
     "@release-it/conventional-changelog": "^10.0.1",
     "@types/file-saver": "^2.0.7",
     "@types/node": "^22.18.0",
-    "@types/ol-ext": "npm:@siedlerchr/types-ol-ext@^3.6.7",
+    "@types/ol-ext": "npm:@siedlerchr/types-ol-ext@^3.6.3",
     "@types/proj4": "^2.19.0",
     "@vitejs/plugin-vue": "^6.0.1",
     "@vitest/coverage-v8": "^3.2.4",