Upgrade flakes, use NVIDIA beta, add Zed inlay hints

- Bumped versions in flake.lock (affinity‑nix, nur‑expressions,
home‑manager, nixpkgs, stylix). - Switched NVIDIA driver package from
stable to beta. - Added Zed `inlay_hints` configuration and
rust‑analyzer inlayHints options.

modules/drivers/nvidia-drivers.nix

@@ -36,7 +36,7 @@ in {
         # accessible via `nvidia-settings`.
         nvidiaSettings = true;
         # Optionally, you may need to select the appropriate driver version for your specific GPU.
-        package = config.boot.kernelPackages.nvidiaPackages.stable;
+        package = config.boot.kernelPackages.nvidiaPackages.beta;
       };
     };
   };