[Feat] Add a persisted opt-in setting for DCG

[navedmerchant]

Related GitHub Issue

Closes #1057
Part of #1049. Split from #1050.

Description

Adds the persisted destructiveCommandGuardEnabled setting across shared types, extension/provider state, SettingsView's local cached state, save handling, and Auto-Approve settings UI.

Enabling verifies DCG installation. Failure normalizes the setting back to disabled and shows a localized error. Existing allowlist/denylist behavior remains available while DCG is disabled. This PR does not yet change command approval policy.

Stack

3 / 4 — base: feat/dcg-binary-service

Depends on PR 2 only for enable-time installation verification.

Test Procedure

pnpm --dir src exec vitest run core/webview/__tests__/ClineProvider.spec.ts core/webview/__tests__/webviewMessageHandler.spec.ts
pnpm --dir webview-ui exec vitest run src/components/settings/__tests__/AutoApproveSettings.spec.tsx
pnpm --dir packages/types check-types
pnpm --dir src check-types
pnpm --dir webview-ui check-types
node scripts/find-missing-translations.js --area=core
node scripts/find-missing-translations.js --area=webview

Result: 183 extension and 11 webview tests passed; all type-checks, lint, and translation validation passed.

Checklist

• Full setting round trip implemented
• SettingsView uses local cached state
• Tests/type-check/lint/i18n checks passing

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[codecov]

Codecov Report

❌ Patch coverage is 77.41935% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ui/src/components/settings/AutoApproveSettings.tsx	68.42%	0 Missing and 6 partials ⚠️
src/core/webview/ClineProvider.ts	50.00%	0 Missing and 1 partial ⚠️

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