mc, yazi: two mouse-driven TUI file managers, themed by the terminal

Neither gets per-wallpaper files. Both draw with the 16 ANSI colours, so
they follow ghostty's palette the moment theme-apply reloads it — no
restart and none of the reflow a GTK theme switch causes.

mc uses a -defbg skin (paints on the terminal's own background); yazi gets
an ANSI-named theme and stylix's hex-writing yazi target is disabled.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

home-manager/fred.nix

@@ -30,6 +30,119 @@ in
     };
   };
 
+  # ── File managers: two TUIs, both mouse-driven ────────────────────────
+  # Neither is themed per wallpaper, on purpose. Both draw with the
+  # terminal's 16 ANSI colours, so they inherit ghostty's palette the
+  # instant theme-apply reloads it — no per-wallpaper files, no restart,
+  # and none of the full-reflow jank a GTK theme switch causes.
+  #
+  # Neither can drag a file into a browser: a TUI has no wayland surface,
+  # so it can never start a drag. Nemo stays installed for that.
+
+  # Midnight Commander — the stronger mouse: double-click opens (do_enter),
+  # the menu bar and F-key bar are clickable, the panel divider drags.
+  programs.mc = lib.mkIf isDesktop {
+    enable = true;
+    settings.Midnight-Commander = {
+      # The -defbg skins paint on `default` — the terminal's own background
+      # — and take foregrounds from the 16-colour palette. That is what
+      # makes this follow the wallpaper for free. The plain skins hardcode
+      # a blue background and would sit there unchanged.
+      skin = "modarcon16-defbg";
+    };
+  };
+
+  # Yazi — lighter mouse (click, scroll), nicer layout, image previews.
+  programs.yazi = lib.mkIf isDesktop {
+    enable = true;
+    enableFishIntegration = true;
+
+    # Off by default; yazi is keyboard-first.
+    settings.mgr.mouse_events = [ "click" "scroll" ];
+
+    # Colour NAMES, not hex — the whole point. "reset" means the terminal's
+    # own fg/bg, and the eight names map onto ghostty's palette, which our
+    # ghostty.conf fills from the wallpaper:
+    #   black=base00  red=base08  green=base0B  yellow=base0A
+    #   blue=base0D (accent)  magenta=base0E  cyan=base0C
+    #   gray=base05 (text)  darkgray=base03 (borders)
+    theme = let
+      accent = "blue";
+      dim = "darkgray";
+      text = "gray";
+      on = c: { fg = "black"; bg = c; };
+      fg = c: { fg = c; };
+      both = c: { fg = c; bg = c; };
+    in {
+      mgr = {
+        cwd = fg accent;
+        find_keyword = { fg = "green"; bold = true; };
+        find_position = fg "magenta";
+        marker_selected = both "yellow";
+        marker_copied = both "green";
+        marker_cut = both "red";
+        border_style = fg dim;
+        count_copied = on "green";
+        count_cut = on "red";
+        count_selected = on "yellow";
+      };
+      indicator.current = { bg = dim; bold = true; };
+      tabs = {
+        active = (on accent) // { bold = true; };
+        inactive = { fg = accent; bg = "black"; };
+      };
+      mode = {
+        normal_main = (on accent) // { bold = true; };
+        normal_alt = { fg = accent; bg = "black"; };
+        select_main = (on "green") // { bold = true; };
+        select_alt = { fg = "green"; bg = "black"; };
+        unset_main = (on "yellow") // { bold = true; };
+        unset_alt = { fg = "yellow"; bg = "black"; };
+      };
+      status = {
+        progress_label = fg text;
+        progress_normal = fg text;
+        progress_error = fg "red";
+        perm_type = fg accent;
+        perm_read = fg "yellow";
+        perm_write = fg "red";
+        perm_exec = fg "green";
+        perm_sep = fg "cyan";
+      };
+      pick = { border = fg accent; active = fg "magenta"; inactive = fg text; };
+      input = { border = fg accent; title = fg text; value = fg text; selected.bg = dim; };
+      completion = {
+        border = fg accent;
+        active = { fg = "magenta"; bg = dim; };
+        inactive = fg text;
+      };
+      tasks = { border = fg accent; title = fg text; hovered = { fg = text; bg = dim; }; };
+      which = {
+        mask.bg = "black";
+        cand = fg "cyan";
+        rest = fg "yellow";
+        desc = fg text;
+        separator_style = fg dim;
+      };
+      help = {
+        on = fg "magenta";
+        run = fg "cyan";
+        desc = fg text;
+        hovered = { fg = text; bg = dim; };
+        footer = fg text;
+      };
+      filetype.rules = [
+        { mime = "image/*"; fg = "cyan"; }
+        { mime = "video/*"; fg = "yellow"; }
+        { mime = "audio/*"; fg = "yellow"; }
+        { mime = "application/zip"; fg = "magenta"; }
+        { mime = "application/gzip"; fg = "magenta"; }
+        { mime = "inode/directory"; fg = accent; bold = true; }
+        { name = "*"; fg = "reset"; }
+      ];
+    };
+  };
+
   # Ghostty — stylix's ghostty target writes the colour theme.
   programs.ghostty = lib.mkIf isDesktop {
     enable = true;