refactor(ui): second-pass factorization audit implementation

refactor(ui): second-pass factorization audit implementation

- Extend useExecuteAction with onSuccess callback support (backward-compatible)
- Migrate startSimulator/stopSimulator/deleteChargingStation to useExecuteAction
- Remove unused useToast imports from ChargingStationsView and CSData
- Extract .supervision-url CSS to shared.css as .input-url
- Add pickPresent helper for identity-key optional spreading in CLI
- Migrate atg.ts optional connectorIds and station.ts delete to helpers
- Add 12 payload helper tests (buildHashIdsPayload/pickDefined/pickPresent)
- Refactor main.ts config fetch from nested promises to async/await
- Remove 2 eslint-disable promise/no-nesting comments