🔐 Implement robust session persistence to avoid 'are you human' captcha checks

- Add comprehensive session persistence with cookies, localStorage, and sessionStorage
- Implement stealth browser features to reduce bot detection
- Add smartLogin() method that prioritizes saved sessions over fresh logins
- Create session management utilities (refresh, clear, test validity)
- Update enhanced screenshot service to use session persistence
- Add comprehensive documentation and test script
- Support manual login fallback when captcha is encountered
- Sessions stored in .tradingview-session/ directory for Docker compatibility

This solves the captcha problem by avoiding repeated logins through persistent sessions.

lib/ai-analysis.ts

@@ -133,8 +133,15 @@ Return only the JSON object with your technical analysis.`
       const json = match[0]
       console.log('Raw JSON from AI:', json)
       
-      const result = JSON.parse(json)
-      console.log('Parsed result:', result)
+      let result
+      try {
+        result = JSON.parse(json)
+        console.log('Parsed result:', result)
+      } catch (parseError) {
+        console.error('Failed to parse JSON:', parseError)
+        console.error('Raw JSON that failed:', json)
+        return null
+      }
       
       // Sanitize the result to ensure no nested objects cause React issues
       const sanitizedResult = {
@@ -146,7 +153,7 @@ Return only the JSON object with your technical analysis.`
         },
         recommendation: result.recommendation || 'HOLD',
         confidence: typeof result.confidence === 'number' ? result.confidence : 0,
-        reasoning: typeof result.reasoning === 'string' ? result.reasoning : String(result.reasoning || ''),
+        reasoning: typeof result.reasoning === 'string' ? result.reasoning : String(result.reasoning || 'Basic technical analysis'),
         ...(result.entry && { entry: result.entry }),
         ...(result.stopLoss && { stopLoss: result.stopLoss }),
         ...(result.takeProfits && { takeProfits: result.takeProfits }),