Implement modular Plasma taskbar pinning system

- Add modular pinning system using NixOS module options
- Each desktop module now defines its own pinned applications:
  * plasma.nix: konsole, dolphin, firefox, tigervnc
  * gaming.nix: steam, discord
  * office.nix: slack, signal, libreoffice-writer, libreoffice-calc
  * dev.nix: windsurf
  * media.nix: rustdesk
  * dnm.nix: tor-browser, kleopatra (moved from crypto.nix)
- Move Plasma config from user-specific to desktop module for consistency
- Rename crypto.nix to dnm.nix and update references
- All users with Plasma desktop get automatic taskbar pinning
- Applications only appear when their desktop modules are active

desktop/office.nix

@@ -1,6 +1,13 @@
-{ config, pkgs, pkgs-unstable, ... }:
+{ config, pkgs, pkgs-unstable, lib, ... }:
 
 {
+  # Add this module's pinned applications
+  desktop.plasma.pinnedApps = [
+    "applications:slack.desktop"               # Team communication
+    "applications:signal-desktop.desktop"     # Private messaging
+    "applications:libreoffice-writer.desktop" # Write (LibreOffice Writer)
+    "applications:libreoffice-calc.desktop"   # Calc (LibreOffice Calc)
+  ];
   environment.systemPackages = with pkgs; [
     libreoffice-qt
     thunderbird
@@ -9,4 +16,7 @@
 #   gimp  # Temporarily commented out to avoid build errors
 #   calibre
   ];
+
+
+
 }