fix(ios): support static frameworks under Expo SDK 57 precompiled pipeline (#4245)

Building @rnmapbox/maps with Expo SDK 56+'s precompiled iOS pipeline and
`useFrameworks: static` (e.g. required by react-native-firebase) failed at
two stages:

1. `pod install` raised `verify_no_static_framework_transitive_dependencies`.
   rnmapbox's pre_install flips the Mapbox pods to dynamic frameworks, then
   Expo's precompiled hook downgrades most of them back to static libraries -
   but not MapboxMaps, leaving a dynamic pod with static dependencies.

2. Even past that, compilation failed with
   `'rnmapbox_maps/rnmapbox_maps-Swift.h' file not found`. The
   RNMBX_USE_FRAMEWORKS macro was frozen at podspec-eval time from the
   USE_FRAMEWORKS env, so the Swift header shim took the framework import path
   while Expo actually built the pod as a static library.

Fixes:
- Resolve the generated Swift header with `__has_include`, which follows the
  pod's actual build output instead of a stale macro (same pattern already
  used in RNMBXFollyConvert.h). The now-unused RNMBX_USE_FRAMEWORKS flag is
  removed.
- Skip the Mapbox dynamic-framework flip when Expo's precompiled pipeline is
  active (EXPO_USE_PRECOMPILED_MODULES=1) so all Mapbox pods stay consistently
  static.

Verified on a fresh Expo SDK 57 (RN 0.86) app with useFrameworks: static:
clean pod install and a successful rnmapbox-maps compile (Xcode 26.6).

Author: mfazekas

ios/RNMBX/rnmapbox_maps-Swift.pre.h

@@ -6,7 +6,7 @@
 @interface MapView : UIView
 @end
 
-#if RNMBX_USE_FRAMEWORKS
+#if __has_include(<rnmapbox_maps/rnmapbox_maps-Swift.h>)
 #import <rnmapbox_maps/rnmapbox_maps-Swift.h>
 #else
 #import <rnmapbox_maps-Swift.h>

rnmapbox-maps.podspec

@@ -199,7 +199,19 @@ end
 
 $rnMapboxMapsTargetsToChangeToDynamic = rnMapboxMapsTargetsToChangeToDynamic
 
+def $RNMapboxMaps._expo_precompiled_pipeline?
+  # Expo SDK 56+ precompiled iOS pipeline (prebuilt React core) downgrades every
+  # framework-style pod back to a static library after the podspec is evaluated.
+  # Flipping the Mapbox pods to dynamic here fights that and leaves an inconsistent
+  # graph (MapboxMaps stays dynamic while its deps get forced static). See #4242.
+  ENV['EXPO_USE_PRECOMPILED_MODULES'] == '1'
+end
+
 def $RNMapboxMaps.pre_install(installer)
+  if $RNMapboxMaps._expo_precompiled_pipeline?
+    Pod::UI.puts "[RNMapbox] Expo precompiled modules pipeline detected (EXPO_USE_PRECOMPILED_MODULES=1) — skipping the Mapbox dynamic-framework flip so all Mapbox pods stay consistently static."
+    return
+  end
   installer.aggregate_targets.each do |target|
     target.pod_targets.select { |p| $rnMapboxMapsTargetsToChangeToDynamic.include?(p.name) }.each do |mobile_events_target|
       mobile_events_target.instance_variable_set(:@build_type,Pod::BuildType.dynamic_framework)
@@ -286,9 +298,6 @@ Pod::Spec.new do |s|
           $RNMapboxMaps._add_compiler_flags(sp, "-DRNMBX_RN_72=1")
         end
       end
-      if ENV['USE_FRAMEWORKS'] || $RNMapboxMapsUseFrameworks
-        $RNMapboxMaps._add_compiler_flags(sp, "-DRNMBX_USE_FRAMEWORKS=1")
-      end
     else
       fail "$RNMapboxMapsImpl should be mapbox but was: $RNMapboxMapsImpl"
     end