Fix login restriction handling and improve AI analysis debugging

- Add proper handling when layouts are private/restricted even with login
- Force re-authentication when restriction is detected without user menu
- Fall back to base chart when layouts are inaccessible
- Add detailed logging to AI analysis service to debug JSON parsing issues
- Log full AI response content and extracted JSON for troubleshooting

This should fix both the login restriction bypass and AI analysis failures.

lib/ai-analysis.ts

@@ -184,16 +184,22 @@ Be concise but thorough. Only return valid JSON.`
         throw new Error('No content received from OpenAI')
       }
 
+      console.log('AI response content:', content)
+
       // Parse the JSON response
       const jsonMatch = content.match(/\{[\s\S]*\}/)
       if (!jsonMatch) {
+        console.error('No JSON found in response. Full content:', content)
         throw new Error('No JSON found in response')
       }
 
+      console.log('Extracted JSON:', jsonMatch[0])
+
       const analysis = JSON.parse(jsonMatch[0])
       
       // Validate the structure
       if (!analysis.summary || !analysis.marketSentiment || !analysis.recommendation || !analysis.confidence) {
+        console.error('Invalid analysis structure:', analysis)
         throw new Error('Invalid analysis structure')
       }