fix(fish): fix TUI exit hang and typing latency in Zellij and Ghostty

platforms/home-manager/modules/nmasur/presets/programs/fish.nix

@@ -69,9 +69,6 @@ in
         set -g fish_cursor_insert line
         set -g fish_cursor_visual block
         set -g fish_cursor_replace_one underscore
-
-        # Fix for lagging after exiting TUIs with Zellij and Ghostty
-        set -a fish_features no-query-term
       '';
       loginShellInit = "";
       shellAbbrs = {
@@ -117,10 +114,17 @@ in
         dr = "docker run --rm -it";
         db = "docker build . -t";
       };
-      shellInit = "";
+      shellInit = ''
+        # Fix for lagging/hanging after exiting TUIs inside terminal multiplexers like Zellij:
+        # Disable fish terminal querying at startup so fish does not query DA1/termcap on return.
+        set -gx fish_features no-query-term
+      '';
     };
 
-    home.sessionVariables.fish_greeting = "";
+    home.sessionVariables = {
+      fish_greeting = "";
+      fish_features = "no-query-term";
+    };
 
   };
 }

platforms/home-manager/modules/nmasur/presets/programs/ghostty.nix

@@ -23,7 +23,7 @@ in
 
       package = if pkgs.stdenv.isDarwin then pkgs.ghostty-bin else pkgs.ghostty;
 
-      enableFishIntegration = true;
+      enableFishIntegration = false; # Handled conditionally below to avoid conflicts inside Zellij/TMUX
       enableBashIntegration = true;
       enableZshIntegration = true;
       installBatSyntax = false; # The file doesn't seem to exist in the pkg
@@ -81,5 +81,12 @@ in
 
     };
 
+    # Conditionally enable Ghostty fish shell integration only when NOT running inside multiplexers like Zellij/TMUX
+    programs.fish.shellInit = ''
+      if set -q GHOSTTY_RESOURCES_DIR; and not set -q ZELLIJ; and not set -q TMUX
+        source "$GHOSTTY_RESOURCES_DIR/shell-integration/fish/vendor_conf.d/ghostty-shell-integration.fish"
+      end
+    '';
+
   };
 }