fix: use default Jira URL when meeting URL is not set

internal/app/app.go

@@ -185,12 +185,18 @@ func (a *App) StartMeeting(participantOrder []uint, attendance map[uint]bool) er
 		}
 	}
 
+	// Use meeting-specific URL, fall back to default from settings
+	jiraURL := meeting.JiraURL
+	if jiraURL == "" && settings != nil {
+		jiraURL = settings.DefaultJiraUrl
+	}
+
 	a.participantURLs = make(map[uint]string)
-	if meeting.JiraURL != "" {
+	if jiraURL != "" {
 		for _, p := range participants {
-			url := meeting.JiraURL
+			url := jiraURL
 			if p.JiraFilter != "" {
-				url = meeting.JiraURL + "&quickFilter=" + p.JiraFilter
+				url = jiraURL + "&quickFilter=" + p.JiraFilter
 			}
 			a.participantURLs[p.ID] = url
 		}