fix(ios): restore LiveDrawWidget identity after apple-targets 5 regeneration

The SDK 56 prebuild derived the widget bundle id from its folder name
(com.sauci.app.widget) and pointed CODE_SIGN_ENTITLEMENTS at the ignored
ios/.targets cache. Restore the shipped com.sauci.app.LiveDrawWidget
identity, the tracked entitlements file, and pin bundleIdentifier in the
target config so future prebuilds keep it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/mobile/targets/widget/generated.entitlements

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+  <dict>
+    <key>com.apple.security.application-groups</key>
+    <array>
+      <string>group.com.sauci.app</string>
+    </array>
+  </dict>
+</plist>