[codex] Persist dashboard account list sort

[plastictaste]

Summary

• persist the dashboard account list sort selection alongside the existing card/list view preference
• wire the dashboard Accounts list to restore and update the saved sort column/direction
• add focused tests for controlled list sorting, preference persistence, and dashboard wiring

Verification

• npm test -- src/features/dashboard/components/account-list.test.tsx src/features/dashboard/components/dashboard-page.test.tsx src/hooks/use-dashboard-preferences.test.ts
• npm run lint
• npm run typecheck
• npm run build
• git diff --check

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[plastictaste]

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