Fix: Always show vonDatum and bisDatum in fetch URL for analog inputs chart

- Ensure local date state is never empty by falling back to default date if Redux is empty
- Prevent missing date values in fetch URL after multiple dropdown or button interactions
- Improves reliability of

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.629",
+  "version": "1.6.630",
   "private": true,
   "scripts": {
     "dev": "next dev",