PyVizAST Prerelease 0.4.0

Bug Fixes:

• Fixed temporary directory cleanup timing in project analysis (data loss issue)
• Fixed boolean detection logic in performance analyzer (nested ternary expression)
• Fixed string concatenation patch generator (loop tracking, init/join placement)
• Fixed memory leak in AST visualizer (animation frame cleanup)
• Fixed retry logic overriding user cancellation (AbortError/CanceledError)
• Fixed hardcoded secret false positives (now excludes env vars, config objects)

New Features:

• Added Python 3.10+ match-case statement support (NodeType.MATCH)
• ChallengesPanel now fetches real data from API instead of hardcoded values

Improvements:

• Relaxed CodeIssue.type validation (allows more issue types with logging)
• Removed setup.py from default ignore patterns (may contain important config)
• Improved hardcoded secret detection with better exclusion patterns
• Unified API version strings to 0.4.0