add dotnet missing notice to welcome messages

Author: mcmonkey4eva

src/Pages/Text2Image.cshtml

@@ -558,7 +558,7 @@
                         <div class="card border-danger mb-3 card-center-container">
                             <div class="card-header">DotNET @Utilities.DotNetVersMissing Missing</div>
                             <div class="card-body">
-                                <p class="card-text">
+                                <p id="dotnet_missing_message" class="card-text">
                                     You do not seem to have DotNET @Utilities.DotNetVersMissing installed - this will be required in a future version of StableSwarmUI.
                                     <br>Please install DotNET SDK @(Utilities.DotNetVersMissing).0 from <a href="https://dotnet.microsoft.com/en-us/download/dotnet/@(Utilities.DotNetVersMissing).0">https://dotnet.microsoft.com/en-us/download/dotnet/@(Utilities.DotNetVersMissing).0</a>
                                 </p>

src/wwwroot/js/genpage/welcomemessages.js

@@ -51,8 +51,17 @@ function automaticWelcomeMessage(override = null) {
         `New feature (2023-12-06): Tab Completion in prompts!\nJust type a '&lt;' symbol and watch the suggestions for prompt-syntax tools appear! <a href="https://github.com/Stability-AI/StableSwarmUI/discussions/11#discussioncomment-7775593">(Feature Announcement Link)</a>`,
         `New feature (2023-12-07): Welcome messages!\nOh, well, hi, that's this right here. <a href="https://github.com/Stability-AI/StableSwarmUI/discussions/11#discussioncomment-7791189">(Feature Announcement Link)</a>`
     ];
+    let dotnetNotice = document.getElementById('dotnet_missing_message');
+    if (dotnetNotice) {
+        messages.push(dotnetNotice.innerHTML.trim());
+    }
     if (override == null) {
-        override = Math.floor(Math.random() * messages.length);
+        if (dotnetNotice) {
+            override = messages.length - 1;
+        }
+        else {
+            override = Math.floor(Math.random() * messages.length);
+        }
     }
     override = override % messages.length;
     if (override < 0) {