home: centralize theme and make home-manager feature-aware

- add home/theme.nix as the single Silicon Volt palette and pass it to
  home modules via extraSpecialArgs
- drive foot, hyprland, hyprlock, mako, fzf, starship, rofi and the
  herdr picker from that palette; raw config files use @color@ tokens
  substituted at build time
- pass my = config.my into home-manager; add my.pi.enable, my.flakeDir
- gate home/pi.nix on my.pi.enable (enabled on hades)
- route zshconf/hyprconf aliases and FLAKE_CONFIG through my.flakeDir
- rename the hyprland monitor option volt.monitors -> hypr.monitors
- fix use_auto_tmux command-substitution bug in zsh/init.zsh
- track home/nvim/config/lazy-lock.json for reproducible plugins
- document theming and toggles in the README

home/hypr/hyprlock.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ theme, ... }:
 
 {
   programs.hyprlock = {
@@ -32,7 +32,7 @@
         {
           monitor = "";
           text = "$TIME";
-          color = "rgba(ffffffdd)";
+          color = "rgba(${theme.bare.textPrimary}dd)";
           font_size = 90;
           font_family = "JetBrainsMono Nerd Font";
           position = "0, 220";
@@ -43,7 +43,7 @@
         {
           monitor = "";
           text = "cmd[update:1000] echo \" $(date +'%A, %B %d') \"";
-          color = "rgba(adaaaaff)";
+          color = "rgba(${theme.bare.textMuted}ff)";
           font_size = 20;
           font_family = "JetBrainsMono Nerd Font";
           position = "0, 120";
@@ -54,7 +54,7 @@
         {
           monitor = "";
           text = "NIXOS // SILICON VOLT";
-          color = "rgba(cffc00ee)";
+          color = "rgba(${theme.bare.accentVolt}ee)";
           font_size = 14;
           font_family = "JetBrainsMono Nerd Font";
           position = "0, 60";
@@ -65,7 +65,7 @@
         {
           monitor = "";
           text = "cmd[update:3600000] echo \" $USER @ $(hostname) \"";
-          color = "rgba(adaaaa99)";
+          color = "rgba(${theme.bare.textMuted}99)";
           font_size = 13;
           font_family = "JetBrainsMono Nerd Font";
           position = "0, -160";
@@ -84,11 +84,11 @@
           dots_spacing = 0.2;
           dots_center = true;
           # Volt lime outline, dark glass interior
-          outer_color = "rgba(cffc00ee)";
-          inner_color = "rgba(1c1b1b, 0.9)";
-          check_color = "rgba(e3ff66ee)";
-          fail_color = "rgba(ff7a59ee)";
-          font_color = "rgba(e5e2e1ff)";
+          outer_color = "rgba(${theme.bare.accentVolt}ee)";
+          inner_color = "rgba(${theme.bare.glassBg}, 0.9)";
+          check_color = "rgba(${theme.bare.accentVoltLight}ee)";
+          fail_color = "rgba(${theme.bare.accentCoral}ee)";
+          font_color = "rgba(${theme.bare.textSecondary}ff)";
           fail_text = "$FAIL (<b>attempts: $ATTEMPTS</b>)";
           fade_on_empty = false;
           placeholder_text = "<i>  Enter Password...</i>";