fix(ios): unbreak Xcode Cloud archive — stop shipping a machine-local NODE_BINARY

The Release archive failed (exit 65) bundling JS: ios/.xcode.env.local was
committed and pinned NODE_BINARY to a path that only exists on one dev's Mac
(/Users/.../.nvm/.../node). RN's "Bundle React Native code and images" phase
sources .xcode.env then .xcode.env.local, so on the CI runner it used the dead
path and couldn't find node. (Builds locally because that path is real there.)

- Untrack .xcode.env.local (git rm --cached; it's already in .gitignore and
  stays on disk for local builds). CI now uses .xcode.env's command -v node.
- Symlink node@22 into /usr/local/bin in ci_post_clone.sh so the build phase
  can actually resolve it — node@22 is keg-only and off the phase's PATH.
  Mirrors the existing Go 1.22 symlink.

Author: TheTrunk

clients/mobile/ios/.xcode.env.local

@@ -13,6 +13,14 @@ brew install node@22 || true
 export PATH="$(brew --prefix node@22)/bin:$PATH"
 corepack enable
 
+# node@22 is keg-only, so it is NOT on the PATH the Xcode "Bundle React Native
+# code and images" build phase runs with. That phase sources ios/.xcode.env,
+# which resolves `command -v node` — so node must be findable at a stable path.
+# Symlink it into /usr/local/bin (already on the build-phase PATH; same trick as
+# the Go symlink below). Without this the Release archive fails to bundle JS.
+NODE22="$(brew --prefix node@22)/bin"
+ln -sf "$NODE22/node" /usr/local/bin/node || sudo ln -sf "$NODE22/node" /usr/local/bin/node || true
+
 # --- shared core: the RN bundle imports @cumulusvpn/core via its built dist ---
 yarn install --immutable
 yarn workspace @cumulusvpn/core build