feat(issues): add updated date sorting

[chengweiv5]

Summary

• add updated-date sorting to issue display settings and localized labels
• support updated_at sorting in flat and grouped issue APIs
• expose the same option through the CLI and document it
• cover local, server, and CLI sorting behavior with tests

Testing

• go test ./internal/handler -run '^TestIssueListsSortByUpdatedAt$'
• go test ./cmd/multica -run 'TestRunIssueList(SendsSortAndDirection|RejectsInvalidSortAndDirection|RejectsDirectionWithoutDirectionalSort)$'
• pnpm exec vitest run packages/views/issues/utils/sort.test.ts
• pnpm typecheck
• git diff --check

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[chengweiv5]

Implemented updated-date sorting across the issue display controls, flat/grouped API paths, and CLI. Added localized labels plus regression coverage for ascending/descending local sorting, server ordering, and CLI query validation. The targeted Go tests, Vitest suite, and full TypeScript typecheck all pass.