Update the project to use Xcode 16.

[pixlwave]

Update the project to use Xcode 16 and the iOS 18 simulator.

• Fastlane uses Xcode 16
• Unit Tests
  • Pass locally
  • Pass on CI
• Preview Tests
  • Pass locally
  • Pass on CI
• UI Tests
  • Pass locally
  • Pass on CI (we're going to prioritise building with Xcode 16 over these as we need it to fix a bug with interactive dismissal of media).
• Integration Tests
  • Pass locally
  • Pass on CI
• Xcode Cloud uses Xcode 16

Bugs

• You can't scroll the timeline by swiping on a bubble.
  • Fixed with the caveat that if you take too long to swipe to reply, you'll trigger the long-press gesture (https://forums.developer.apple.com/forums/thread/760035)

[github-actions]

	Warnings
⚠️	This pull request seems relatively large. Please consider splitting it into multiple smaller ones.
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against 9f90298

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
824	1	823	0

View the top 1 failed tests by shortest run time

UserSessionFlowCoordinatorTests testReplaceDetailsWithTimeline()

Stack Traces | 3.73s run time

XCTAssertTrue failed (.../UnitTests/Sources/UserSessionFlowCoordinatorTests.swift:165)

To view individual test run time comparison to the main branch, go to the Test Analytics Dashboard

[Velin92]

LGTM

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud