feat(logging): implement configurable log levels via VITE_LOG_LEVEL

Add comprehensive logging configuration system with environment variable support.
Environment files now include appropriate log levels per build mode:
- Development: debug (maximum visibility)
- Production: warn (minimal noise)
- Testing: info (balanced output)

Includes smart default behavior based on platform and environment,
enhanced logger methods for level checking, and comprehensive documentation.
All existing logging calls remain backward compatible.

Closes logging configuration request

src/components/DataExportSection.vue

@@ -187,9 +187,10 @@ export default class DataExportSection extends Vue {
         const exContact: Contact = R.omit(["contactMethods"], contact);
         // now add contactMethods as a true array of ContactMethod objects
         exContact.contactMethods = contact.contactMethods
-          ? (typeof contact.contactMethods === 'string' && contact.contactMethods.trim() !== '' 
-              ? JSON.parse(contact.contactMethods) 
-              : [])
+          ? typeof contact.contactMethods === "string" &&
+            contact.contactMethods.trim() !== ""
+            ? JSON.parse(contact.contactMethods)
+            : []
           : [];
         return exContact;
       });