chore: install Android API 34 platform before macOS MAUI build

[devin-ai-integration]

Summary

The build-maui job (macos-latest) has failed every day since 2026-07-05, when the macOS runner image stopped shipping the Android API level 34 platform:

error XA5207: Could not find android.jar for API level 34 ...
expected to be in `/Users/runner/Library/Android/sdk/platforms/android-34/android.jar`

Adds the MSBuild-recommended step before the Android build, which installs the missing platform (and accepts licenses) into the runner's existing SDK directory:

dotnet build MauiApp -f net8.0-android -t:InstallAndroidDependencies \
  -p:AndroidSdkDirectory="${ANDROID_HOME:-$HOME/Library/Android/sdk}" -p:AcceptAndroidSDKLicenses=True

The Linux build-and-run job is unaffected (that image still has API 34) and is left unchanged.

Latest failing run: https://github.com/launchdarkly/hello-dotnet-client/actions/runs/30441473256

Link to Devin session: https://app.devin.ai/sessions/bbaa402957474f3ab30fe102ed0316e2

---

Note

Low Risk
CI-only workflow change with no application or runtime behavior impact.

Overview
Fixes daily failures in the build-maui job on macos-latest caused by the runner image no longer including Android API 34 (XA5207 / missing android.jar).

Adds an Install Android SDK dependencies step that runs MSBuild InstallAndroidDependencies against MauiApp for net8.0-android, pointing at the runner SDK (ANDROID_HOME or ~/Library/Android/sdk) and accepting licenses, before the existing Android build step. The Ubuntu build-and-run job is unchanged.

^{Reviewed by Cursor Bugbot for commit 3964373. Bugbot is set up for automated code reviews on this repo. Configure here.}

[devin-ai-integration]

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