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9ab588078e
The WebSocket echo server tests connect immediately after seeing
'Starting server on port:' in the device log, but URI handlers
(/ws, /auth) are registered asynchronously after the server starts,
taking 40-660ms depending on config and CI load.
This causes two failures:
1. WebSocket handshake returns 404 Not Found because the URI
handler is not registered yet when the client connects.
2. WebSocket echo returns wrong data because the server is in a
partially initialized state.
Wait for 'Returned from app_main()' before connecting, which
guarantees all URI handlers are registered. Add connection retry
with WebSocketBadStatusException handling to WsClient.
Extract _wait_for_server_ready() helper to deduplicate the WiFi
credential input and server readiness logic.
(cherry picked from commit 7a50e3ab04)