Run CI with Xcode 26.1 RC (#4672)

* Use Xcode 26.1 RC on CI

* regenerated previews with 26.1

* ui tests

* fix

* fix some iPad tests rendering

* remove useless fastlane line

---------

Co-authored-by: Doug <douglase@element.io>

fastlane/Fastfile

@@ -7,10 +7,10 @@ if File.exist?(enterprise)
   import enterprise
 end
 
-simulator_version = "26.0"
+simulator_version = "26.1"
 
 before_all do
-  xcversion(version: "~> 26.0.0")
+  xcversion(version: "~> 26.1")
 
   ENV["FASTLANE_XCODEBUILD_SETTINGS_TIMEOUT"] = "180"
   ENV["FASTLANE_XCODE_LIST_TIMEOUT"] = "180"
@@ -53,17 +53,17 @@ lane :ui_tests do |options|
   # Presumably because launching 2 simulators uses more memory than the runner has available.
   
   if options[:device] == "iPhone"
-    device = "iPhone-26.0"
+    device = "iPhone-#{simulator_version}"
     
     create_simulator_if_necessary(
-      name: "iPhone-26.0",
+      name: "iPhone-#{simulator_version}",
       type: "com.apple.CoreSimulator.SimDeviceType.iPhone-17"
     )
   elsif options[:device] == "iPad"
-    device = "iPad-26.0"
+    device = "iPad-#{simulator_version}"
     
     create_simulator_if_necessary(
-      name: "iPad-26.0",
+      name: "iPad-#{simulator_version}",
       type: "com.apple.CoreSimulator.SimDeviceType.iPad-A16"
     )
   else
@@ -333,4 +333,4 @@ private_lane :create_simulator_if_necessary do |options|
   end
   
   # device_id is unused right now but is useful to check e.g. the boot status of a simulator.
-end
+end