fix(install): pin the common nixos-hardware profile stacks into the ISO

Round 7 in-VM: autodetection emitted common-cpu-intel, whose nixos-hardware
module pulls the whole Intel graphics stack (intel-media-driver,
compute-runtime, libva, level-zero…) — none of it on the ISO, so the
offline install built graphics drivers from source. The representative
pin now imports the common-* profiles (intel+amd cpu/gpu, laptop, ssd,
pc), covering what the detector emits on ordinary machines.
Model-specific profiles may still need network.

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

flake.nix

@@ -226,6 +226,18 @@
                     modules = [
                       self.nixosModules.nomarchy
                       { environment.systemPackages = [ home-manager.packages.${system}.home-manager ]; }
+                      # The installer's autodetection emits these on real
+                      # machines (and the intel CPU module pulls the whole
+                      # iGPU stack) — without them an offline install on
+                      # common hardware builds graphics drivers from
+                      # source. Model-specific profiles may still need
+                      # network; the common ground is covered.
+                      nixos-hardware.nixosModules.common-cpu-intel
+                      nixos-hardware.nixosModules.common-cpu-amd
+                      nixos-hardware.nixosModules.common-gpu-amd
+                      nixos-hardware.nixosModules.common-pc-laptop
+                      nixos-hardware.nixosModules.common-pc-ssd
+                      nixos-hardware.nixosModules.common-pc
                       (./templates/downstream + "/hardware-configuration.nix")
                       (./templates/downstream + "/system.nix")
                       ({ lib, ... }: {