pinchflat: correct esbuild symlink name on Darwin

The tailwind and esbuild libraries expect different Darwin target names
(`macos-*` and `darwin-*`), so each binary has to be symlinked under the name
its own library looks for.

The esbuild binary was instead symlinked under tailwind's `macos-*` name, so
the esbuild library did not find it and fell back to downloading esbuild from
npm at build time; that download fails in sandboxed and offline builds such as
nixpkgs-review (no network or CA bundle).

Assisted-by: Claude Code (Claude Opus 4.8)

pkgs/by-name/pi/pinchflat/package.nix

@@ -58,10 +58,13 @@ beamPackages.mixRelease rec {
     patchShebangs ~/assets/node_modules
 
     # phoenixframework expects platform-specific tailwind/esbuild binaries in a specific location:
-    # https://github.com/phoenixframework/tailwind/blob/194ab0f979782e4ccf2fe796042bf8e20967df93/lib/tailwind.ex#L243-L251
-    targets="linux-x64 linux-arm64 macos-x64 macos-arm64"
-    for target in $targets; do
+    # tailwind: https://github.com/phoenixframework/tailwind/blob/194ab0f979782e4ccf2fe796042bf8e20967df93/lib/tailwind.ex#L243-L251
+    for target in linux-x64 linux-arm64 macos-x64 macos-arm64; do
       ln -s "${tailwindcss}/bin/tailwindcss" "_build/tailwind-$target"
+    done
+
+    # esbuild: https://github.com/phoenixframework/esbuild/blob/v0.10.0/lib/esbuild.ex#L270-L300
+    for target in linux-x64 linux-arm64 darwin-x64 darwin-arm64; do
       ln -s "${esbuild}/bin/esbuild" "_build/esbuild-$target"
     done