fix(nix): use pkgsJs stdenv for Darwin builds to fix native module compilation
Switch from pkgs.stdenv (nixpkgs-25.11) to pkgsJs.stdenv (nixpkgs-22.11) for Darwin daedalus derivation to fix native module compilation issues. Root cause: - Darwin native modules (bigint-buffer, blake-hash, etc.) fail to compile with the newer clang 21.1.7 from nixpkgs-25.11 - These modules were built/tested with the older toolchain from nixpkgs-22.11-darwin - Using mismatched stdenv and darwin frameworks causes compilation errors Solution: - Use pkgsJs.stdenv.mkDerivation for the main daedalus package - This provides the older, stable Darwin toolchain that native modules expect - Aligns with existing use of pkgsJs.darwin frameworks and pkgsJs.python3 - Removes the clang++ wrapper that was causing 'Argument list too long' errors The wrapper approach is no longer needed because: - CXXFLAGS=-Wno-error is set via environment variables in patchElectronRebuild - Using the correct stdenv avoids the enum-constexpr issues entirely