fix(nix): use llvmPackages_latest.lld for WASM linking

Switch from bintools to lld directly from llvmPackages_latest.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: billf

nix/apps.nix

@@ -16,7 +16,7 @@
         pkgs.cargo-nextest
         pkgs.wasm-tools
         pkgs.wasmtime
-        pkgs.llvmPackages.bintools
+        pkgs.llvmPackages_latest.lld
       ];
     in
     {

nix/crane.nix

@@ -34,7 +34,7 @@
         meta.platforms = pkgs.lib.platforms.unix;
 
         nativeBuildInputs = [
-          pkgs.llvmPackages.bintools # for lld (WASM linking)
+          pkgs.llvmPackages_latest.lld
         ];
 
         # Environment for WASM builds