Extract literal strings from complex modals to notification constants

Replace hardcoded text in raw $notify calls with centralized constants:
- MembersList.vue: 2 complex modals (contact admission workflow)
- ContactsView.vue: 2 complex modals (registration, onboarding meeting)
- ProjectViewView.vue: 1 complex modal (claim confirmation)

Preserves advanced modal features (promptToStopAsking, custom buttons,
nested workflows) while standardizing text through constants for
maintainability and future localization support.

src/views/ContactsView.vue

@@ -309,6 +309,8 @@ import {
   NOTIFY_REGISTER_PERSON_ERROR,
   NOTIFY_VISIBILITY_ERROR,
   NOTIFY_UNCONFIRMED_HOURS,
+  NOTIFY_REGISTER_CONTACT,
+  NOTIFY_ONBOARDING_MEETING,
 } from "@/constants/notifications";
 
 @Component({
@@ -636,10 +638,8 @@ export default class ContactsView extends Vue {
           resp.status,
           resp.data,
         );
-        this.notify.error(
-          `Got an error retrieving your ${useRecipient ? "given" : "received"} data from the server.`,
-          TIMEOUTS.STANDARD,
-        );
+        const message = `Got an error retrieving your ${useRecipient ? "given" : "received"} data from the server.`;
+        this.notify.error(message, TIMEOUTS.STANDARD);
       }
     };
 
@@ -882,8 +882,8 @@ export default class ContactsView extends Vue {
                 {
                   group: "modal",
                   type: "confirm",
-                  title: "Register",
-                  text: "Do you want to register them?",
+                  title: NOTIFY_REGISTER_CONTACT.title,
+                  text: NOTIFY_REGISTER_CONTACT.text,
                   onCancel: async (stopAsking?: boolean) => {
                     if (stopAsking) {
                       await this.$updateSettings({
@@ -1237,16 +1237,16 @@ export default class ContactsView extends Vue {
           {
             group: "modal",
             type: "confirm",
-            title: "Onboarding Meeting",
-            text: "Would you like to start a new meeting?",
+            title: NOTIFY_ONBOARDING_MEETING.title,
+            text: NOTIFY_ONBOARDING_MEETING.text,
             onYes: async () => {
               this.$router.push({ name: "onboard-meeting-setup" });
             },
-            yesText: "Start New Meeting",
+            yesText: NOTIFY_ONBOARDING_MEETING.yesText,
             onNo: async () => {
               this.$router.push({ name: "onboard-meeting-list" });
             },
-            noText: "Join Existing Meeting",
+            noText: NOTIFY_ONBOARDING_MEETING.noText,
           },
           TIMEOUTS.MODAL,
         );