Initial commit

src/PowderCoating.Application/DTOs/QuickBooks/ImportErrorDto.cs

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+namespace PowderCoating.Application.DTOs.QuickBooks;
+
+/// <summary>
+/// A single entry in an import log — covers errors, warnings, and skipped records.
+/// </summary>
+public class ImportErrorDto
+{
+    /// <summary>"Error", "Warning", or "Skipped"</summary>
+    public string Severity { get; set; } = "Error";
+
+    public int LineNumber { get; set; }
+    public string? RecordName { get; set; }
+    public string? FieldName { get; set; }
+    public string ErrorMessage { get; set; } = string.Empty;
+
+    public string DisplayMessage =>
+        $"[{Severity}]" +
+        (LineNumber > 0 ? $" Line {LineNumber}" : "") +
+        (string.IsNullOrEmpty(RecordName) ? "" : $" ({RecordName})") +
+        (string.IsNullOrEmpty(FieldName) ? "" : $" — {FieldName}") +
+        $": {ErrorMessage}";
+}

src/PowderCoating.Application/DTOs/QuickBooks/ImportResultDto.cs

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+namespace PowderCoating.Application.DTOs.QuickBooks;
+
+/// <summary>
+/// Result of an import operation from QuickBooks IIF file.
+/// </summary>
+public class ImportResultDto
+{
+    public bool Success { get; set; }
+    public int TotalRecords { get; set; }
+    public int ImportedCount { get; set; }
+    public int UpdatedCount { get; set; }
+    public int SkippedCount { get; set; }
+    /// <summary>
+    /// Records that were intentionally not re-imported because they already exist
+    /// in the destination (positive outcome — not an error or warning).
+    /// Displayed to the user separately from SkippedCount to avoid confusion.
+    /// </summary>
+    public int AlreadyRecordedCount { get; set; }
+    public List<ImportErrorDto> Errors { get; set; } = new();
+
+    public string Summary =>
+        $"{ImportedCount} imported, {UpdatedCount} updated, {SkippedCount} skipped out of {TotalRecords} total records.";
+}

src/PowderCoating.Application/DTOs/QuickBooks/ValidationResultDto.cs

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+namespace PowderCoating.Application.DTOs.QuickBooks;
+
+/// <summary>
+/// Result of validating an IIF file before import.
+/// </summary>
+public class ValidationResultDto
+{
+    public bool IsValid { get; set; }
+    public List<ImportErrorDto> Errors { get; set; } = new();
+}