Add error handling for closed and draft surveys; update related interfaces

src/app/pages/participate/participate.page.ts

@@ -249,7 +249,7 @@ export class ParticipatePage implements OnInit, OnDestroy {
   }
 
   private friendlyError(
-    reason: 'invalid_token' | 'already_submitted' | 'survey_not_found'
+    reason: 'invalid_token' | 'already_submitted' | 'survey_not_found' | 'survey_closed' | 'survey_draft'
   ): string {
     switch (reason) {
       case 'invalid_token':
@@ -258,6 +258,10 @@ export class ParticipatePage implements OnInit, OnDestroy {
         return 'You have already submitted a response for this survey. Each link can only be used once.';
       case 'survey_not_found':
         return 'The survey could not be found on the host. It may have been deleted.';
+      case 'survey_draft':
+        return 'This survey is not yet open for responses. Please try again later.';
+      case 'survey_closed':
+        return 'This survey is closed and no longer accepting responses.';
     }
   }
 }

src/app/pages/survey-detail/survey-detail.page.html

@@ -85,7 +85,8 @@
       </ion-item>
 
       <div class="ion-margin-top button-row">
-        <ion-button *ngIf="!isHosting" expand="block" (click)="startHosting()">
+        <ion-button *ngIf="!isHosting" expand="block" (click)="startHosting()"
+                    [disabled]="survey.status !== 'active'">
           <ion-icon slot="start" name="play-outline"></ion-icon>
           Start Hosting
         </ion-button>

src/app/pages/survey-detail/survey-detail.page.ts

@@ -12,7 +12,7 @@
 
 import { Component, OnInit, OnDestroy } from '@angular/core';
 import { ActivatedRoute, Router } from '@angular/router';
-import { ToastController, AlertController, Platform } from '@ionic/angular';
+import { ToastController } from '@ionic/angular';
 import { DataConnection } from 'peerjs';
 import { Subscription } from 'rxjs';
 import { SurveyService } from '../../services/survey.service';
@@ -52,9 +52,7 @@ export class SurveyDetailPage implements OnInit, OnDestroy {
     private surveyService: SurveyService,
     private responseService: ResponseService,
     private peerService: PeerService,
-    private toastCtrl: ToastController,
-    private alertCtrl: AlertController,
-    private platform: Platform
+    private toastCtrl: ToastController
   ) {}
 
   async ngOnInit(): Promise<void> {
@@ -228,6 +226,16 @@ export class SurveyDetailPage implements OnInit, OnDestroy {
     if (!this.survey) return;
 
     if (msg.type === 'join') {
+      if (this.survey.status === 'draft') {
+        conn.send({ type: 'error', reason: 'survey_draft' } as P2PMessage);
+        return;
+      }
+
+      if (this.survey.status === 'closed') {
+        conn.send({ type: 'error', reason: 'survey_closed' } as P2PMessage);
+        return;
+      }
+
       const participant = await this.surveyService.getParticipant(msg.token);
 
       if (!participant || participant.surveyId !== this.surveyId) {

src/app/shared/models/survey.models.ts

@@ -134,4 +134,4 @@ export type P2PMessage =
   /** Host acknowledges a successful submit or update */
   | { type: 'ack'; status: 'submitted' | 'updated' }
   /** Host signals an error — participant should display the reason */
-  | { type: 'error'; reason: 'invalid_token' | 'already_submitted' | 'survey_not_found' };
+  | { type: 'error'; reason: 'invalid_token' | 'already_submitted' | 'survey_not_found' | 'survey_closed' | 'survey_draft' };