Pin the UI locale to the language setting and add theme + language selectors with a dark palette

src/shared/domain.ts

@@ -14,7 +14,7 @@ export type { MigrationCutoverEventRecord, MigrationReconciliationItemRecord, Ro
 export { EVAL_SUITE_KEY, PR_BOT_GATE_KEY, SDLC_REVIEW_AGENT_KEY, SDLC_REVIEW_TARGET_TYPE, SDLC_RUN_STATE, type EvalCaseRecord, type EvalRunRecord, type EvalSuiteKey, type EvalSuiteRecord, type PrBotGateKey, type PrBotGateRecord, type SdlcReviewAgentKey, type SdlcReviewAgentRecord, type SdlcReviewRunRecord, type SdlcReviewTargetType, type SdlcRunState } from "./sdlc-domain";
 export { SEARCH_ENTITY_TYPES, type SearchEntityType, type SearchResultRecord } from "./search-domain";
 export type { BrowserActionPolicyRecord, BrowserActionRecord, BrowserSessionContainerRecord, SocialAccountGrantRecord, SocialAccountRecord, SocialApprovalRouteRecord, SocialAuditRecord } from "./social-domain";
-export type { AppSnapshot } from "./snapshot-domain";
+export type { AppSnapshot, UiLanguage, UiPreferences, UiTheme } from "./snapshot-domain";
 export const TASK_STATUS = { BACKLOG: "backlog", IN_PROGRESS: "in_progress", REVIEW: "review", DONE: "done" } as const;
 export const APPROVAL_STATE = { PENDING: "pending", APPROVED: "approved", DECLINED: "declined" } as const;
 export const RISK_LEVEL = { LOW: "low", MEDIUM: "medium", HIGH: "high" } as const;