🧹 Simplify deep nesting in layout conflict view class extraction

[synaptode]

🎯 What: Extracted the nested parsing logic in flushCapturedConflict into a new extractViewClass(from:) helper function.
💡 Why: Improves readability and maintainability by flattening a deep block (for -> if-let -> if-let -> if-let/else) without changing functional behavior.
✅ Verification: Code logic is equivalent using the Swift Substring API. The break behavior is preserved and verified by code review and local static testing files.
✨ Result: PhantomLayoutConflictDetector is now cleaner and easier to reason about when resolving layout issues.

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PR created automatically by Jules for task 5812377916110807781 started by @synaptode

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