Make the Pool join button explicitly submit its form; the shared Button otherwise defaults to type=button.
Add a multi-node Electron E2E that joins a coordinator with a one-use worker invitation and verifies the coordinator records the joining node.
Validation
Full Electron E2E: 16/16 passed.
Unit tests: 76/76 passed.
Typecheck and production build passed.
## Summary
- Make the Pool join button explicitly submit its form; the shared Button otherwise defaults to type=button.
- Add a multi-node Electron E2E that joins a coordinator with a one-use worker invitation and verifies the coordinator records the joining node.
## Validation
- Full Electron E2E: 16/16 passed.
- Unit tests: 76/76 passed.
- Typecheck and production build passed.
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Summary
Validation