feat(export): Replace CSV export with standardized JSON format

- Add contactsToExportJson utility function for standardized data export
- Replace CSV export with JSON format in DataExportSection
- Update file extension and MIME type to application/json
- Remove Dexie-specific export logic in favor of unified SQLite/Dexie approach
- Update success notifications to reflect JSON format
- Add TypeScript interfaces for export data structure

This change improves data portability and standardization by:
- Using a consistent JSON format for data export/import
- Supporting both SQLite and Dexie databases
- Including all contact fields in export
- Properly handling contactMethods as stringified JSON
- Maintaining backward compatibility with existing import tools

Security: No sensitive data exposure, maintains existing access controls

src/views/AccountViewView.vue

@@ -1119,7 +1119,6 @@ export default class AccountViewView extends Vue {
    */
   async mounted() {
     try {
-      console.log("[AccountViewView] mounted");
       // Initialize component state with values from the database or defaults
       await this.initializeState();
       await this.processIdentity();
@@ -1172,7 +1171,6 @@ export default class AccountViewView extends Vue {
         }
       }
     } catch (error) {
-      console.log("[AccountViewView] error: ", JSON.stringify(error, null, 2));
       // this can happen when running automated tests in dev mode because notifications don't work
       logger.error(
         "Telling user to clear cache at page create because:",
@@ -1206,7 +1204,6 @@ export default class AccountViewView extends Vue {
           this.turnOffNotifyingFlags();
         }
       }
-      // console.log("Got to the end of 'mounted' call in AccountViewView.");
       /**
        * Beware! I've seen where we never get to this point because "ready" never resolves.
        */