chore: migrate to LDClient.init timeout variant

[kinyoklion]

Summary

The example already targets the latest stable com.launchdarkly:launchdarkly-android-client-sdk (5.13.1, latest on Maven Central), so no version bump was needed. The only change is migrating away from a deprecated SDK API:

LDClient.init(app, config, context) (3-arg, returns Future<LDClient>) is @Deprecated in the current SDK — initializing without a timeout is no longer recommended. Migrated to the documented replacement init(Application, LDConfig, LDContext, int startWaitSeconds):

- LDClient.init(this, ldConfig, context);
+ LDClient.init(this, ldConfig, context, 5); // wait up to 5s for initialization

No other deprecated SDK APIs are in use (LDClient.get, boolVariation, registerFeatureFlagListener, flush, LDConfig.Builder(AutoEnvAttributes), LDContext.builder).

Verification

./gradlew :app:assembleDebug compiles cleanly against SDK 5.13.1. I was also able to boot a headless Android 34 emulator on this Linux VM and run the app: it initialized the client and displayed Feature flag 'my-boolean-flag' is false, confirming the new init call works at runtime.

The "Process/System UI isn't responding" dialog is an emulator SystemUI ANR under software rendering (swiftshader), unrelated to the app — the app UI (title hello-android, flag evaluation text) renders correctly behind it.

Notes

• No README changes needed (it does not reference an SDK version or platform requirement that changed).
• No secrets committed; the mobile key used for the runtime test was injected only into the uncommitted working tree and reverted.

Link to Devin session: https://app.devin.ai/sessions/c3b6a36dd8f2496580fc709886c15915
Requested by: @kinyoklion

---

Note

Low Risk
Single-line SDK API migration in the sample app’s startup path; no auth, data, or dependency version changes.

Overview
Replaces the deprecated three-argument LDClient.init in MainApplication with the SDK-recommended overload that passes 5 as startWaitSeconds, so app startup can block briefly while the client fetches fresh flag values.

Inline comments document that initialization may time out after five seconds while the client remains usable with cached values.

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