🧹 Fix missing edge case for empty strings in paths slice

[theRebelliousNerd]

🎯 What: Modified AnalyzeFiles to skip empty paths ("") before execution. Also updated detectLanguage and matchesPath utilities to safely handle empty string inputs. Updated the TestEdgeCaseDetectorGap_EmptyPathString gap test to expect the correct behavior (0 decisions instead of 1).
💡 Why: This resolves the explicit TODO about the missing edge case, preventing AnalyzeFiles from performing wasted operations on invalid empty paths, and makes utility behavior explicit and safe for empty paths, improving maintainability and reliability.
✅ Verification: Ran go test ./... and confirmed all tests passed. Tested the specific regression gap test TestEdgeCaseDetectorGap_EmptyPathString.
✨ Result: Cleaned up code health issue, implemented explicit behaviors for empty string corner cases, and eliminated the corresponding bug.

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PR created automatically by Jules for task 8951425447403696617 started by @theRebelliousNerd

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dad718cd-b788-4f7f-8790-5e472b62cc2f

📥 Commits

Reviewing files that changed from the base of the PR and between cc0e10f and 695c0bf.

📒 Files selected for processing (2)

• internal/campaign/edge_case_detector.go
• internal/campaign/edge_case_detector_gaps_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-edge-case-detector-empty-paths-8951425447403696617

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