[nix-deck] Use NixOS unstable for better Jovian compatibility

- Switch nix-deck to use nixpkgs-unstable and unstable home-manager/plasma-manager
- Remove jovian-compat.nix shim (not needed on unstable)
- Add bitwarden-desktop compatibility overlay for stable/unstable coexistence
- Update hardware-configuration.nix with actual Steam Deck hardware detection
- Add 8GB swap file configuration
- Configure AMD CPU microcode updates

This allows nix-deck to work with the latest Jovian-NixOS while keeping other
machines on stable 25.05.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

flake.nix

@@ -16,12 +16,23 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
+    home-manager-unstable = {
+      url = "github:nix-community/home-manager/master";
+      inputs.nixpkgs.follows = "nixpkgs-unstable";
+    };
+
     plasma-manager = {
       url = "github:nix-community/plasma-manager";
       inputs.nixpkgs.follows = "nixpkgs";
       inputs.home-manager.follows = "home-manager";
     };
 
+    plasma-manager-unstable = {
+      url = "github:nix-community/plasma-manager";
+      inputs.nixpkgs.follows = "nixpkgs-unstable";
+      inputs.home-manager.follows = "home-manager-unstable";
+    };
+
     google-cookie-retrieval = {
       url = "git+https://git.johnogle.info/johno/google-cookie-retrieval.git";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -29,7 +40,7 @@
 
     jovian = {
       url = "github:Jovian-Experiments/Jovian-NixOS";
-      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.nixpkgs.follows = "nixpkgs-unstable";
     };
   };
 
@@ -38,7 +49,6 @@
       ./roles
     ] ++ [
       inputs.home-manager.nixosModules.home-manager
-      ./roles/jovian-compat.nix  # Compatibility shim for Jovian on stable NixOS
       inputs.jovian.nixosModules.jovian
       {
         nixpkgs.overlays = [
@@ -48,6 +58,8 @@
               config.allowUnfree = true;
             };
             custom = prev.callPackage ./packages {};
+            # Compatibility: bitwarden renamed to bitwarden-desktop in unstable
+            bitwarden-desktop = prev.bitwarden-desktop or prev.bitwarden;
           })
         ];
         home-manager.useGlobalPkgs = true;
@@ -60,6 +72,34 @@
         };
       }
     ];
+    # Modules for unstable-based systems (like nix-deck)
+    nixosModulesUnstable = [
+      ./roles
+    ] ++ [
+      inputs.home-manager-unstable.nixosModules.home-manager
+      inputs.jovian.nixosModules.jovian
+      {
+        nixpkgs.overlays = [
+          (final: prev: {
+            unstable = import nixpkgs-unstable {
+              system = prev.system;
+              config.allowUnfree = true;
+            };
+            custom = prev.callPackage ./packages {};
+            # Compatibility: bitwarden renamed to bitwarden-desktop in unstable
+            bitwarden-desktop = prev.bitwarden-desktop or prev.bitwarden;
+          })
+        ];
+        home-manager.useGlobalPkgs = true;
+        home-manager.useUserPackages = true;
+        home-manager.sharedModules = [
+          inputs.plasma-manager-unstable.homeModules.plasma-manager
+        ];
+        home-manager.extraSpecialArgs = {
+          globalInputs = inputs;
+        };
+      }
+    ];
     darwinModules = [
       ./roles/darwin.nix
     ] ++ [
@@ -72,6 +112,8 @@
               config.allowUnfree = true;
             };
             custom = prev.callPackage ./packages {};
+            # Compatibility: bitwarden renamed to bitwarden-desktop in unstable
+            bitwarden-desktop = prev.bitwarden-desktop or prev.bitwarden;
           })
         ];
         home-manager.useGlobalPkgs = true;
@@ -149,10 +191,10 @@
       ];
     };
 
-    # Steam Deck configuration
-    nixosConfigurations.nix-deck = nixpkgs.lib.nixosSystem rec {
+    # Steam Deck configuration (using unstable for better Jovian compatibility)
+    nixosConfigurations.nix-deck = nixpkgs-unstable.lib.nixosSystem rec {
       system = "x86_64-linux";
-      modules = nixosModules ++ [
+      modules = nixosModulesUnstable ++ [
         ./machines/nix-deck/configuration.nix
         {
           home-manager.users.johno = import ./home/home-desktop.nix;