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>

flake.lock

@@ -118,24 +118,6 @@
         "type": "github"
       }
     },
-    "flake-utils_2": {
-      "inputs": {
-        "systems": "systems_2"
-      },
-      "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "home-manager": {
       "inputs": {
         "nixpkgs": [
@@ -197,6 +179,21 @@
         "type": "github"
       }
     },
+    "nix-flatpak": {
+      "locked": {
+        "lastModified": 1783368811,
+        "narHash": "sha256-0H8jDwR4Kegb3heaTrH1ftbgKfZVDT8JE+46uXxDy/Q=",
+        "owner": "gmodena",
+        "repo": "nix-flatpak",
+        "rev": "20d42f0ee98c9fe9f85e8d1de474f1409ed10d05",
+        "type": "github"
+      },
+      "original": {
+        "owner": "gmodena",
+        "repo": "nix-flatpak",
+        "type": "github"
+      }
+    },
     "nix-vm-test": {
       "inputs": {
         "nixpkgs": [
@@ -350,42 +347,6 @@
         "type": "github"
       }
     },
-    "nixpkgs_3": {
-      "locked": {
-        "lastModified": 1775888245,
-        "narHash": "sha256-nwASzrRDD1JBEu/o8ekKYEXm/oJW6EMCzCRdrwcLe90=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "13043924aaa7375ce482ebe2494338e058282925",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "proton-pass-cli": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1783676260,
-        "narHash": "sha256-J7yTLWLkhOOGT/YLyfgC3lEOCRTOXVK3h0UoKzhRels=",
-        "owner": "tomsch",
-        "repo": "proton-pass-cli-nix",
-        "rev": "1cad55698affce949d4cebacae31db448c17d9f1",
-        "type": "github"
-      },
-      "original": {
-        "owner": "tomsch",
-        "repo": "proton-pass-cli-nix",
-        "type": "github"
-      }
-    },
     "pyproject-build-systems": {
       "inputs": {
         "nixpkgs": [
@@ -486,37 +447,17 @@
         "type": "github"
       }
     },
-    "qbz": {
-      "inputs": {
-        "flake-utils": "flake-utils_2",
-        "nixpkgs": "nixpkgs_3"
-      },
-      "locked": {
-        "lastModified": 1784877312,
-        "narHash": "sha256-eQ4xvBKnQp4C5lEVukx/75umFFmWyCjbuO82qyFDw14=",
-        "owner": "vicrodh",
-        "repo": "qbz",
-        "rev": "c4cc755fd02d999084883e864c0697139a8b8648",
-        "type": "github"
-      },
-      "original": {
-        "owner": "vicrodh",
-        "repo": "qbz",
-        "type": "github"
-      }
-    },
     "root": {
       "inputs": {
         "authentik-nix": "authentik-nix",
         "disko": "disko",
         "home-manager": "home-manager",
         "mediamanager-nix": "mediamanager-nix",
+        "nix-flatpak": "nix-flatpak",
         "nixos-anywhere": "nixos-anywhere",
         "nixos-images": "nixos-images",
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-unstable": "nixpkgs-unstable",
-        "proton-pass-cli": "proton-pass-cli",
-        "qbz": "qbz",
         "sops-nix": "sops-nix"
       }
     },
@@ -555,21 +496,6 @@
         "type": "github"
       }
     },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
     "treefmt-nix": {
       "inputs": {
         "nixpkgs": [