fix: preserve contact methods and notes in export/import workflow

- Fix contactMethods not being exported (was checking for string instead of array)
- Add missing notes and iViewContent fields to $insertContact method
- Normalize empty strings to null when saving contacts in ContactEditView

This ensures contact data integrity is maintained during export/import operations.

src/utils/PlatformServiceMixin.ts

@@ -1367,6 +1367,9 @@ export const PlatformServiceMixin = {
             contact.profileImageUrl !== undefined
               ? contact.profileImageUrl
               : null,
+          notes: contact.notes !== undefined ? contact.notes : null,
+          iViewContent:
+            contact.iViewContent !== undefined ? contact.iViewContent : null,
           contactMethods:
             contact.contactMethods !== undefined
               ? Array.isArray(contact.contactMethods)
@@ -1377,8 +1380,8 @@ export const PlatformServiceMixin = {
 
         await this.$dbExec(
           `INSERT OR REPLACE INTO contacts 
-           (did, name, publicKeyBase64, seesMe, registered, nextPubKeyHashB64, profileImageUrl, contactMethods) 
-           VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+           (did, name, publicKeyBase64, seesMe, registered, nextPubKeyHashB64, profileImageUrl, notes, iViewContent, contactMethods) 
+           VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
           [
             safeContact.did,
             safeContact.name,
@@ -1387,6 +1390,8 @@ export const PlatformServiceMixin = {
             safeContact.registered,
             safeContact.nextPubKeyHashB64,
             safeContact.profileImageUrl,
+            safeContact.notes,
+            safeContact.iViewContent,
             safeContact.contactMethods,
           ],
         );