fix: -4pt adjustment for fixed columns

Author: Iakov Senatov

GUI/Sources/Features/Panels/FileTable/NSFileTableView.swift

@@ -44,7 +44,8 @@ struct NSFileTableView: NSViewRepresentable {
         tableView.allowsColumnResizing = false
         tableView.allowsColumnSelection = false
         tableView.columnAutoresizingStyle = .noColumnAutoresizing
-        tableView.gridStyleMask = []  // Grid lines disabled - header dividers are sufficient
+        tableView.gridStyleMask = .solidVerticalGridLineMask
+        tableView.gridColor = NSColor.separatorColor.withAlphaComponent(0.4)
         tableView.focusRingType = .none
         tableView.headerView = nil  // SwiftUI header
 
@@ -159,11 +160,11 @@ struct NSFileTableView: NSViewRepresentable {
         // Name takes remaining space after fixed columns and dividers
         let nameWidth = max(100, scrollWidth - fixedColumnsWidth - dividersWidth)
 
-        // Sync widths - use exact spec.width for fixed columns
+        // Sync widths - fixed columns need -4pt adjustment to align with SwiftUI header
         for (i, spec) in visibleSpecs.enumerated() {
             guard i < tableView.tableColumns.count else { break }
             let col = tableView.tableColumns[i]
-            let targetWidth = spec.id == .name ? nameWidth : spec.width
+            let targetWidth = spec.id == .name ? nameWidth : (spec.width - 4.0)
 
             if abs(col.width - targetWidth) > 0.5 {
                 col.width = targetWidth