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/home/zed/user-settings/default.nix

@@ -16,6 +16,16 @@ _: {
       enabled = true;
       max_severity = "error";
     };
+    inlay_hints = {
+      enabled = true;
+      show_type_hints = true;
+      show_parameter_hints = true;
+      show_other_hints = true;
+      show_background = false;
+      edit_debounce_ms = 700;
+      scroll_debounce_ms = 50;
+      toggle_on_modifiers_press = null;
+    };
   };
 
   imports = [