terra: flatpak, unstable packages, GTK dark theme, comms workspace

- nix-flatpak input; discord, telegram, qbz as Flathub flatpaks; removes
  qbz and proton-pass-cli flake inputs
- proton-pass-cli and claude-code from nixpkgs-unstable via extraSpecialArgs
- dconf color-scheme = prefer-dark replaces per-session gsettings call

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

hosts/terra/home.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ pkgs, unstable, ... }:
 
 # home-manager profile for darman on terra. The Hyprland config lives in its
 # own module (./hyprland.nix); this handles the rest of the user session
@@ -27,6 +27,14 @@
     };
   };
 
+  # GTK4 / libadwaita apps ignore gtk-theme-name; they only read the dconf
+  # color-scheme key via the portal. Writing it here persists it across reboots
+  # (the gsettings call in the Hyprland autostart only lasts the session).
+  dconf.settings."org/gnome/desktop/interface" = {
+    color-scheme = "prefer-dark";
+    gtk-theme = "Dracula";
+  };
+
   # dracula-qt5-theme ships only a qt5ct color scheme (no style plugin), so
   # Qt has to go through qt(5|6)ct rather than a direct style/platformTheme
   # name. "qtct" pulls in both qt5ct and qt6ct; qt6ct reads its own config
@@ -57,7 +65,7 @@
   home.packages = [
     (pkgs.writeTextDir "share/mime/packages/application-x-ms-sln.xml"
       (builtins.readFile ../../dotfiles/mime/application-x-ms-sln.xml))
-    pkgs.claude-code
+    unstable.claude-code
     pkgs.quickshell
     pkgs.opencode
     pkgs.hyprcursor