fix compile errors in applyPatch - remove Task.detached

fix escape chars in closures

fix compile errors in applyPatch - remove Task.detached

fix: star.badge.plus→star.fill, cache shortKind O(1)

perf: cache UTType lookups in KindCell

Kind col: short ext (MP3_PARTIAL→MP3) + UTType tooltip

permissions tooltip zeigt octal (755) bei hover

add cellPadding 6pt inside columns - header+rows match

fix doppel-scan bei navigation - remove redundant refreshFiles calls

perf: smart skip poll wenn FSEvents aktiv, interval 60→300s

remove unnecessary cache - tooltip is on-demand

perf: incremental FSEvents patch O(log n), childCount updates for subdirs

perf: skip redundant cache rebuild when files unchanged

column minWidth based on header text+icon width

Author: Iakov Senatov

GUI/Resources/Localizable.xcstrings

@@ -1182,6 +1182,10 @@
         }
       }
     },
+    "Folder" : {
+      "comment" : "A description of a folder.",
+      "isCommentAutoGenerated" : true
+    },
     "Folder Access" : {
 
     },
@@ -2133,6 +2137,10 @@
         }
       }
     },
+    "Symbolic Link to Folder" : {
+      "comment" : "A tooltip for a folder that is a symbolic link.",
+      "isCommentAutoGenerated" : true
+    },
     "Target file already exists:" : {
       "comment" : "Target exists message",
       "localizations" : {

GUI/Sources/Config/AppConstants.swift

@@ -19,7 +19,7 @@ enum AppConstants {
         static let maxDepth = 2
 
         /// Refresh interval for directory monitoring (seconds)
-        static let refreshInterval: TimeInterval = 60
+        static let refreshInterval: TimeInterval = 300
     }
 
     // MARK: - History limits

GUI/Sources/ContextMenu/ActionsEnums/DirectoryAction.swift

@@ -90,7 +90,7 @@ enum DirectoryAction: String, CaseIterable, Identifiable {
         case .delete: return "trash"
         case .getInfo: return "info.circle"
         case .openOnOtherPanel: return "arrow.left.arrow.right.square"
-        case .addToFavorites: return "star.badge.plus"
+        case .addToFavorites: return "star.fill"
         }
     }
 

GUI/Sources/ContextMenu/ActionsEnums/FileAction.swift

@@ -90,7 +90,7 @@ enum FileAction: String, CaseIterable, Identifiable {
         case .rename: return "pencil"
         case .delete: return "trash"
         case .getInfo: return "info.circle"
-        case .addToFavorites: return "star.badge.plus"
+        case .addToFavorites: return "star.fill"
         }
     }
 

GUI/Sources/Features/Panels/FileRow.swift

@@ -30,10 +30,10 @@ struct FileRow: View {
     @State private var isDropTargeted: Bool = false
 
     // MARK: - Selection colors — live from ColorThemeStore
-    private var selectionActiveFill: Color   { colorStore.activeTheme.selectionActive }
+    private var selectionActiveFill: Color { colorStore.activeTheme.selectionActive }
     private var selectionInactiveFill: Color { colorStore.activeTheme.selectionInactive }
 
-    private static let dropTargetFill  = Color.accentColor.opacity(0.2)
+    private static let dropTargetFill = Color.accentColor.opacity(0.2)
     private static let dropTargetBorder = Color.accentColor
 
     private var isActivePanel: Bool {
@@ -315,6 +315,7 @@ struct FileRow: View {
                     .foregroundStyle(cellColor(for: spec.id))
                     .lineLimit(1)
                     .truncationMode(.tail)
+                    .padding(.horizontal, TableColumnDefaults.cellPadding)
                     .frame(width: spec.width, alignment: spec.id.alignment)
             }
         }
@@ -329,7 +330,7 @@ struct FileRow: View {
             case .dateModified: Text(file.modifiedDateFormatted)
             case .size: Text(file.fileSizeFormatted)
             case .kind: KindCell(file: file)
-            case .permissions: Text(file.permissionsFormatted)
+            case .permissions: PermissionsCell(permissions: file.permissionsFormatted)
             case .owner: Text(file.ownerFormatted)
             case .childCount: Text(file.childCountFormatted)
             case .dateCreated: Text(file.creationDateFormatted)
@@ -341,20 +342,83 @@ struct FileRow: View {
 }
 
 // MARK: - Kind column cell
-/// Shows a multicolor folder SF Symbol for directories, plain text for files.
+// MARK: - Kind column cell
+/// Shows short kind (extension) with full UTType description in tooltip
 private struct KindCell: View {
     let file: CustomFile
+
     var body: some View {
         if file.isDirectory || file.isSymbolicDirectory {
             Image(systemName: file.isSymbolicDirectory ? "folder.badge.questionmark" : "folder.fill")
                 .symbolRenderingMode(.multicolor)
                 .font(.system(size: 12, weight: .regular))
+                .help(file.isSymbolicDirectory ? "Symbolic Link to Folder" : "Folder")
         } else if file.isSymbolicLink {
             Image(systemName: "arrow.up.right.square")
                 .symbolRenderingMode(.multicolor)
                 .font(.system(size: 12, weight: .regular))
+                .help("Symbolic Link")
         } else {
-            Text(file.kindFormatted)
+            Text(shortKind)
+                .help(fullKindDescription)
+        }
+    }
+
+    /// Short kind: extension truncated at _ or -
+    private var shortKind: String {
+        let ext = file.fileExtension.uppercased()
+        if ext.isEmpty { return "Doc" }
+        if let idx = ext.firstIndex(where: { $0 == "_" || $0 == "-" }) {
+            return String(ext[..<idx])
         }
+        if ext.count > 5 { return String(ext.prefix(4)) + "…" }
+        return ext
+    }
+
+    /// Full description from UTType (on-demand, no cache needed)
+    private var fullKindDescription: String {
+        let ext = file.fileExtension.lowercased()
+        guard !ext.isEmpty else { return "Document" }
+        if let uttype = UTType(filenameExtension: ext),
+            let desc = uttype.localizedDescription
+        {
+            return desc
+        }
+        return ext.uppercased()
+    }
+}
+
+private struct PermissionsCell: View {
+    let permissions: String
+
+    var body: some View {
+        Text(permissions)
+            .help(octalValue)
+    }
+
+    /// Convert symbolic permissions (rwxr-xr-x) to octal (755)
+    private var octalValue: String {
+        let chars = Array(permissions)
+        guard chars.count >= 9 else { return permissions }
+
+        // Take last 9 characters (skip type indicator like 'd' or '-')
+        let permChars = chars.suffix(9)
+        guard permChars.count == 9 else { return permissions }
+
+        let arr = Array(permChars)
+        let owner = tripletToOctal(arr[0], arr[1], arr[2])
+        let group = tripletToOctal(arr[3], arr[4], arr[5])
+        let other = tripletToOctal(arr[6], arr[7], arr[8])
+
+        return "\(owner)\(group)\(other)"
+    }
+
+    /// Convert rwx triplet to octal digit (0-7)
+    private func tripletToOctal(_ r: Character, _ w: Character, _ x: Character) -> Int {
+        var value = 0
+        if r == "r" { value += 4 }
+        if w == "w" { value += 2 }
+        if x == "x" || x == "s" || x == "t" { value += 1 }
+        return value
     }
 }

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

@@ -75,6 +75,16 @@ enum ColumnID: String, CaseIterable, Codable, Identifiable, Transferable {
 
     var isRequired: Bool { self == .name }
 
+    // Minimum width based on header text + icon + sort arrow + padding
+    var minHeaderWidth: CGFloat {
+        let font = NSFont.systemFont(ofSize: 12, weight: .medium)
+        let textWidth = (title as NSString).size(withAttributes: [.font: font]).width
+        let iconWidth: CGFloat = icon != nil ? 18 : 0
+        let sortArrowWidth: CGFloat = 16
+        let padding: CGFloat = 20
+        return ceil(textWidth + iconWidth + sortArrowWidth + padding)
+    }
+
     var alignment: Alignment {
         switch self {
         case .size, .childCount: .trailing
@@ -177,7 +187,7 @@ final class ColumnLayoutModel {
 
     func setWidth(_ width: CGFloat, for id: ColumnID) {
         if let idx = columns.firstIndex(where: { $0.id == id }) {
-            columns[idx].width = max(TableColumnDefaults.minWidth, min(width, TableColumnDefaults.maxWidth))
+            columns[idx].width = max(id.minHeaderWidth, min(width, TableColumnDefaults.maxWidth))
             layoutVersion += 1
         }
     }

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

@@ -51,7 +51,7 @@ struct TableHeaderView: View {
                         get: { spec.width },
                         set: { layout.setWidth($0, for: spec.id) }
                     ),
-                    min: TableColumnDefaults.minWidth,
+                    min: spec.id.minHeaderWidth,
                     max: TableColumnDefaults.maxWidth,
                     onEnd: { layout.saveWidths() }
                 )
@@ -102,8 +102,8 @@ struct TableHeaderView: View {
                 autoFitColumn(spec.id)
             }
         )
+                .padding(.horizontal, TableColumnDefaults.cellPadding)
         .frame(width: spec.width, alignment: spec.id.alignment)
-        // No padding - width must match NSTableView column exactly
         .background(
             dragOverTargetID == spec.id
                 ? Color.accentColor.opacity(0.15)
@@ -216,7 +216,7 @@ struct TableHeaderView: View {
             if w > maxW { maxW = w }
         }
         let optimal = ceil(maxW + 16)
-        let clamped = Swift.min(Swift.max(optimal, TableColumnDefaults.minWidth), TableColumnDefaults.maxWidth)
+        let clamped = Swift.min(Swift.max(optimal, col.minHeaderWidth), TableColumnDefaults.maxWidth)
         layout.setWidth(clamped, for: col)
         layout.saveWidths()
         log.debug("[AutoFit] col=\(col) optimal=\(Int(clamped))pt")

GUI/Sources/Features/Panels/FileTable/TableView/FileTableView+State.swift

@@ -11,12 +11,18 @@ import SwiftUI
 // MARK: - State Management
 extension FileTableView {
 
+    /// Track last files reference to skip redundant rebuilds
+    private static var lastFilesHash: [PanelSide: Int] = [:]
+    
     func recomputeSortedCache() {
-        // Files arrive pre-sorted from DualDirectoryScanner.Task.detached.
-        // Local re-sort is only needed when user changes sort column/direction
-        // (onChange of sortKey/bSortAscending). On plain files change the order
-        // is already correct — just assign without re-sorting to avoid blocking
-        // MainActor for ~100ms on 26k-item directories.
+        // Quick check: skip if files array is identical (same reference or content)
+        let newHash = files.count ^ (files.first?.id.hashValue ?? 0) ^ (files.last?.id.hashValue ?? 0)
+        if Self.lastFilesHash[panelSide] == newHash && cachedSortedFiles.count == files.count {
+            log.debug("[Cache] panel=\(panelSide) skip rebuild — no changes detected")
+            return
+        }
+        Self.lastFilesHash[panelSide] = newHash
+        
         let t0 = Date()
         cachedSortedFiles = files
         rebuildIndexByID()