Fix: account unreachable after 9.1.15 update (radiance startup race)

[david-lant]

Summary

Auto-fix for Freshdesk ticket #180332 — Pro Android users report "更新以后登录不了" (can't log in after updating) on client 9.1.15.

Root cause: HomeNotifier.build() (lib/features/home/provider/home_notifier.dart) fetched user data exactly once at cold start. On Android, the Go core (radiance) is set up asynchronously (SetupRadiance completes ~4–7s after launch) while the Flutter MethodChannel is live immediately. When getUserData() lands before lanternCore.Store, it returns radiance not initialized; the keepAlive provider caches that failure with no retry, so user stays null and every account tap shows "Unable to open account" for the whole session. The 9.1.15 radiance dependency bump made SetupRadiance deterministically finish after build(), turning a previously-winnable race into a 0/4 failure.

What changed: build() now retries getUserData() with a bounded backoff (up to 10 attempts, 1s apart) instead of throwing on the first failure. The provider stays in loading during the radiance-setup window and resolves once the core is ready; if it genuinely never succeeds it still throws after attempts are exhausted. Single-file, ~25 lines.

Test plan

• Cold-start 9.1.15 on Android and confirm the account loads without a restart (force SetupRadiance to lose the race).
• Confirm the initial getUserData failure is followed by a later successful load.
• Check the normal (radiance-ready) path has no added delay.

Follow-up (out of scope)

Cleaner long-term fix: invalidate homeProvider / call refreshUser() on a radiance-ready event. Left as follow-up per the diagnosis Unresolved notes.

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Auto-generated by /ticket-autodiagnose -> /issue-fix. Draft — needs human review + a build/analyze run before merge.

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