Fix desktop file format in all desktop modules

- Remove incorrect 'applications:' prefix from desktop file names
- All modules now use correct format (e.g., 'steam.desktop' not 'applications:steam.desktop')
- Fixed modules: gaming.nix, office.nix, dev.nix, media.nix, dnm.nix
- Modular Plasma pinning system now works correctly for all desktop modules
- All 14 applications should now appear pinned after Plasma session restart

desktop/dev.nix

@@ -3,7 +3,7 @@
 {
   # Add this module's pinned applications
   desktop.plasma.pinnedApps = [
-    "applications:windsurf.desktop"     # Windsurf IDE
+    "windsurf.desktop"     # Windsurf IDE
   ];
 
   environment.systemPackages = with pkgs; [

desktop/dnm.nix

@@ -3,8 +3,8 @@
 {
   # Add this module's pinned applications
   desktop.plasma.pinnedApps = [
-    "applications:tor-browser.desktop"         # Tor browser
-    "applications:org.kde.kleopatra.desktop"   # Kleopatra GPG
+    "tor-browser.desktop"         # Tor browser
+    "org.kde.kleopatra.desktop"   # Kleopatra GPG
   ];
 
   environment.systemPackages = with pkgs; [

desktop/gaming.nix

@@ -3,8 +3,8 @@
 {
   # Add this module's pinned applications
   desktop.plasma.pinnedApps = [
-    "applications:steam.desktop"     # Steam gaming platform
-    "applications:discord.desktop"   # Gaming communication
+    "steam.desktop"     # Steam gaming platform
+    "discord.desktop"   # Gaming communication
   ];
 
   environment.systemPackages = with pkgs; [

desktop/media.nix

@@ -3,7 +3,7 @@
 {
   # Add this module's pinned applications
   desktop.plasma.pinnedApps = [
-    "applications:rustdesk.desktop"     # Remote desktop client
+    "rustdesk.desktop"     # Remote desktop client
   ];
   environment.systemPackages = with pkgs; [
     vlc           # Media player

desktop/office.nix

@@ -3,10 +3,10 @@
 {
   # 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)
+    "slack.desktop"               # Team communication
+    "signal-desktop.desktop"     # Private messaging
+    "libreoffice-writer.desktop" # Write (LibreOffice Writer)
+    "libreoffice-calc.desktop"   # Calc (LibreOffice Calc)
   ];
   environment.systemPackages = with pkgs; [
     libreoffice-qt