fix: flush offline outbox after reconnect

[rdlabo]

Summary

• keep the network connectivity signal subscribed before offline sync initialization completes
• automatically flush a durable pending outbox when connectivity returns
• add a regression test for offline initialization followed by reconnect

Root cause

The reconnect effect short-circuited on the non-reactive initialized flag during its first run. Because it never read the connectivity signal, later network changes did not schedule the effect again.

Impact

Applications could preserve an offline mutation in the outbox but leave it pending indefinitely after reconnect, until another code path explicitly called flush().

Validation

• npm run prebuild
• npm test (all projects; kit 530 tests)
• npm run lint
• winecode live browser E2E: replica read → offline mutation → pending outbox → reconnect → exactly-once server confirmation

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.