Initialize empty slice explicitly in GetLogFiles

[zhubert]

Summary

Changes GetLogFiles to explicitly initialize an empty slice instead of using a nil slice declaration, ensuring consistent return behavior.

Changes

• Replace var files []LogFile with files := []LogFile{} for explicit empty slice initialization
• Add documentation clarifying that the function always returns a non-nil slice

Test plan

• Run go test ./internal/ui/... to verify existing tests pass
• Verify that callers of GetLogFiles handle the return value correctly (no nil checks needed)

[github-actions]

🔍 Deadcode Analysis

✅ No unreachable functions detected. Nice work keeping the codebase clean!