Add Demo Mode and error handling to AE_AITools component

- Implemented 'Demo Mode' fallback when no API token is provided.
- Ensured the AI modal opens even on connection errors to display troubleshooting info.
- Improved user feedback with simulated loading states for demo data.

src/lib/ae_elements/AE_AITools.svelte

@@ -63,14 +63,28 @@
             return;
         }
 
+        active_tab = 'result';
+        
+        // If no token is provided, trigger a "Demo Mode" placeholder after a fake delay
+        if (!token || token === '') {
+            console.log('AE_AITools: No token provided. Entering Demo Mode.');
+            ae_promises = new Promise((resolve) => {
+                setTimeout(() => {
+                    tmp_summary = `### AI Summary (DEMO MODE)\n\nThis is a placeholder summary because no API token was provided in the settings. \n\n**Original Content Length:** ${content.length} characters.\n\n**System Prompt:** ${systemPrompt}\n\n**Model:** ${model}`;
+                    show_modal = true;
+                    resolve(true);
+                }, 1500);
+            });
+            return;
+        }
+
         const ai_client = new OpenAI({
-            apiKey: token || 'no-token-provided',
+            apiKey: token,
             baseURL: baseUrl,
             dangerouslyAllowBrowser: true
         });
 
         try {
-            active_tab = 'result';
             ae_promises = ai_client.chat.completions.create({
                 model: model,
                 max_tokens: maxTokens,
@@ -86,7 +100,10 @@
             });
         } catch (err: any) {
             console.error('AE_AITools: AI Error:', err);
-            alert('AI Error: ' + err.message);
+            // Even on error, show the modal with the error message so the UI can be inspected
+            tmp_summary = `### AI Error\n\nFailed to connect to the AI service.\n\n**Error:** ${err.message}\n\nCheck your Settings tab for Base URL and Token configuration.`;
+            show_modal = true;
+            ae_promises = Promise.resolve();
         }
     }