fix: sync on setSelectedAccounts & fix network name format

[orestiseth]

Note

Capitalize the displayed network name in the send form and replace FullScanSelectedAccounts with SyncSelectedAccounts that uses synchronize, updating routing, scheduling, and tests; bump manifest.

• Handlers:
  • Replace CronMethod.FullScanSelectedAccounts with CronMethod.SyncSelectedAccounts and switch logic from accountsUseCases.fullScan to accountsUseCases.synchronize(account, 'metamask') in CronHandler.
  • Update request schema to SyncSelectedAccountsRequest and route handling to syncSelectedAccounts(...).
  • KeyringHandler.setSelectedAccounts now schedules background event with CronMethod.SyncSelectedAccounts.
• UI:
  • Add displayNetwork(network) in infra/jsx/format.ts to capitalize network.
  • Use displayNetwork and adjust layout props (center) in UnifiedSendFormView.
• Tests:
  • Update CronHandler.test.ts to reflect SyncSelectedAccounts and synchronize calls; keep full-scan single-account tests.
• Manifest:
  • Bump packages/snap/snap.manifest.json version to 1.4.3 and update shasum.

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[zone-live]

LGTM

[orestiseth]