Normalize Nix module formatting and update flake.lock

Consistently format module argument blocks and convert aligned
package comments to inline comments. Trim trailing whitespace and
minor layout tweaks across modules. Bump opencode rev, narHash and
lastModified in flake.lock and remove the original dev ref.

modules/shell.nix

@@ -1,6 +1,11 @@
 # modules/shell.nix
 # Fish shell configuration with plugins and aliases
-{ config, pkgs, lib, ... }:
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
 
 {
   # Enable Fish shell
@@ -98,13 +103,13 @@
   # Fish plugins (managed by NixOS)
   environment.systemPackages = with pkgs; [
     # Fish plugins
-    fishPlugins.pure           # Pure prompt (minimal & fast)
-    fishPlugins.autopair       # Auto-close brackets, quotes
-    fishPlugins.fzf-fish       # Fzf integration for fish
-    fishPlugins.done           # Notification when long command finishes
-    fishPlugins.grc            # Colorize command output
+    fishPlugins.pure # Pure prompt (minimal & fast)
+    fishPlugins.autopair # Auto-close brackets, quotes
+    fishPlugins.fzf-fish # Fzf integration for fish
+    fishPlugins.done # Notification when long command finishes
+    fishPlugins.grc # Colorize command output
 
     # Required by aliases
-    dust                       # Better du
+    dust # Better du
   ];
 }