Replace hardcoded notification strings with standardized constants

- Replace literal strings with notification constants in ContactsView.vue:
  * "Got an error sending the invite." → NOTIFY_INVITE_ERROR.message
  * "Could not set visibility on the server." → NOTIFY_VISIBILITY_ERROR.message
  * "Unconfirmed Hours" → NOTIFY_UNCONFIRMED_HOURS.title
- Remove unused NOTIFY_REGISTER_PROCESSING import
- Remove unused NOTIFICATION_TIMEOUTS constant in ShareMyContactInfoView.vue
- Fix unused parameter warnings in danger() and warning() methods
- Resolve all notification-related linting errors

src/constants/notifications.ts

@@ -74,7 +74,8 @@ export const NOTIFY_VISIBILITY_REFRESHED = {
 // ContactsView.vue specific constants
 export const NOTIFY_BLANK_INVITE = {
   title: "Blank Invite",
-  message: "The invite was not included, which can happen when your iOS device cuts off the link. Try pasting the full link into a browser.",
+  message:
+    "The invite was not included, which can happen when your iOS device cuts off the link. Try pasting the full link into a browser.",
 };
 
 export const NOTIFY_INVITE_REGISTRATION_SUCCESS = {