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5f89874b - Always use flutter build when running tests + fix server reuse tests (#1959)

Always use flutter build when running tests + fix server reuse tests (#1959) * Switch to always running Flutter version for server tests * WIP: Fix server reconnect test - uses dart:html! * Create HTML stub to use dart:html on web * Change import to relative * Remove unused import * Improve error * Enable web support for integration tests * Move reconnect handling into Scaffold * nit: remove "back" * Revert unnecessary null handling