refactor: consolidate tmux config into home-manager 🎨

Remove system-level tmux.nix; home.nix is now the single source.
Port resize-pane shortcuts (H/J/K/L) from the old config.

nixos/flake.nix

@@ -35,7 +35,6 @@
           nixos-wsl.nixosModules.default
           vscode-server.nixosModules.default
           ./hosts/wsl.nix
-          ./tmux.nix
           ./fish.nix
 
           # Home Manager on WSL

nixos/home/danny/home.nix

@@ -43,6 +43,12 @@
       bind -r C-h select-window -t :-
       bind -r C-l select-window -t :+
 
+      # Resize pane shortcuts
+      bind -r H resize-pane -L 10
+      bind -r J resize-pane -D 10
+      bind -r K resize-pane -U 10
+      bind -r L resize-pane -R 10
+
       # split with dash and vbar
       bind | split-window -h -c "#{pane_current_path}"
       bind - split-window -v -c "#{pane_current_path}"

nixos/tmux.nix

@@ -1,57 +0,0 @@
-{ config, pkgs, ... }:
-
-{
-  programs.tmux = {
-    enable = true;
-    clock24 = true;
-    escapeTime = 20;
-    keyMode = "vi";
-    historyLimit = 100000;
-    baseIndex = 1;
-
-    extraConfig = ''
-      # remap prefix from ^+B to alt-f
-      unbind C-b
-      set -g prefix M-f
-      bind M-f send-prefix
-
-      # nvim 'checkhealth' advice
-      set-option -g focus-events on
-      set-option -sa terminal-overrides ',xterm-256color:RGB'
-      set-option -g default-terminal "screen-256color"
-
-      # enable mouse support for switching panes/windows
-      set -g mouse on
-
-      # pane movement shortcuts
-      bind h select-pane -L
-      bind j select-pane -D
-      bind k select-pane -U
-      bind l select-pane -R
-
-      # window selection
-      bind -r C-h select-window -t :-
-      bind -r C-l select-window -t :+
-
-      # Resize pane shortcuts
-      bind -r H resize-pane -L 10
-      bind -r J resize-pane -D 10
-      bind -r K resize-pane -U 10
-      bind -r L resize-pane -R 10
-
-      # split with dash and vbar
-      bind | split-window -h -c "#{pane_current_path}"
-      bind - split-window -v -c "#{pane_current_path}"
-
-      # server-tmux only:
-      # fix ssh agent when tmux is detached
-      # setenv -g SSH_AUTH_SOCK $HOME/.ssh/ssh_auth_sock
-    '';
-    plugins = [
-      # pkgs.tmuxPlugins.tmux-powerline # status bar
-      pkgs.tmuxPlugins.catppuccin
-      pkgs.tmuxPlugins.tmux-fzf       # search tmux commands (prefix + F)
-      pkgs.tmuxPlugins.extrakto       # fuzzyfind text history (prefix + tab)
-    ];
-  };
-}