refactor, feat: added proton auth support, added instruction for proton, added errors, some refactor and cleanup

docs/guides/how-to-add-totps/README.md

@@ -14,11 +14,9 @@ Then press OK, record will appear on page
 
 ![Added record](image-4.png)
 
-You can edit your otpauth:// records using button "Change TOTP link". Your previous record will be replaced with a new otpauth:// link from text field, and previous link will not be shown on field.
-
 ### If you use google migrations (otpauth-migration:// links)
 
-To add 2FA TOTP recods using migration from Google Authenticator app, you must go to menu, select "Transfer accounts" -> "Export accounts"
+To add 2FA TOTP records using migration from Google Authenticator app, you must go to menu, select "Transfer accounts" -> "Export accounts"
 
 Select codes then screenshot QR code and scan (decode) it to a URI. Use any app providing scan from image, ex: "Search screen" function (Google Lens) on Google Assistant.
 
@@ -34,4 +32,20 @@ Then press OK, all selected records from Google Authenticator will appear on pag
 
 ![Added records from otpauth-migration](image-7.png)
 
-You can edit your records using button "Change TOTP link". Your previous record will be replaced with a new otpauth:// link from text field (otpauth-migration:// will not work), and previous link will not be shown on field.
+
+### If you use Proton Authenticator
+
+To add 2FA TOTP records from Proton Authenticator you must go to settings and press "Export":
+ ![alt text](photo_2025-08-08_17-10-27.jpg)
+
+After this save file and open it on text editor:
+
+![alt text](photo_2025-08-08_17-10-35.jpg)
+![alt text](photo_2025-08-08_17-10-41.jpg)
+
+Copy all stuff from file at clipboard and import in application:
+![alt text](photo_2025-08-08_17-10-38.jpg)
+![alt text](<Снимок экрана_20250808_170854.png>)
+
+Then press OK, records will appear on page:
+![alt text](<Снимок экрана_20250808_170912.png>)