Sumeru / #638 - Prevent TransactionTooLargeException for large in-app messages

[sumeruchat]

Summary

• Strip HTML content from fragment arguments during onSaveInstanceState to avoid exceeding the Binder transaction limit (~1MB) when large in-app HTML (>250KB) is persisted via the saved state bundle.
• Gracefully dismiss the in-app notification fragment if HTML content is unavailable after state restoration (e.g., when it was stripped to prevent the crash).

Test plan

• Verify that in-app messages with large HTML content (>250KB) no longer cause TransactionTooLargeException when the activity goes through save/restore state cycles (e.g., backgrounding the app, rotating the device).
• Verify that if the fragment is recreated after state restoration with stripped HTML, it dismisses gracefully without a crash.
• Verify that normal-sized in-app messages continue to display and function correctly.
• Verify that in-app open tracking is not duplicated on state restoration.

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