Add full shell, replaceable Omics adapter and bilingual interaction

Implement approved specification #32 and tickets #33-#37. Keep host authentication server-verified and pin session interaction language. Compile scoped base selectors for browser compatibility and retain full gutters during CSS pruning.

frontend/src/shell/database-management/messages.ts

@@ -0,0 +1,28 @@
+import type { TranslationParams } from "../../i18n";
+
+/** Keep IDs and parameters in state so open results follow later locale changes. */
+export type AdminMessage = string | {
+  message: string;
+  params?: Readonly<Record<string, string | number | { message: string }>>;
+};
+
+export function adminMessage(message: string, params?: Exclude<AdminMessage, string>["params"]): AdminMessage {
+  return { message, params };
+}
+
+/** Local API diagnostics retain their code; translate only the known message body. */
+export function renderAdminDiagnostic(t: (message: string) => string, diagnostic: string): string {
+  const match = /^([a-z][a-z_]+): (.+)$/.exec(diagnostic);
+  return match ? `${match[1]}: ${t(match[2])}` : t(diagnostic);
+}
+
+export function renderAdminMessage(
+  t: (message: string, params?: TranslationParams) => string,
+  value: AdminMessage,
+): string {
+  if (typeof value === "string") return t(value);
+  const params = value.params && Object.fromEntries(Object.entries(value.params).map(([key, param]) =>
+    [key, typeof param === "object" ? t(param.message) : param],
+  ));
+  return t(value.message, params);
+}