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/viewers/ArtifactView.tsx

@@ -1,4 +1,5 @@
 import type { ReactElement } from "react";
+import { useI18n } from "../i18n";
 import { SqlViewer, type SqlBlock } from "./SqlViewer";
 import { SchemaLinkingViewer, type SchemaLinking } from "./SchemaLinkingViewer";
 import { MarkdownView } from "./MarkdownView";
@@ -105,6 +106,7 @@ function humanizeKey(k: string): string {
  *  visual hierarchy: top-level sections are split by hairline rules, nested fields
  *  sit tighter, and object-arrays become grouped cards. */
 function StructuredValue({ value, depth = 0 }: { value: unknown; depth?: number }): ReactElement {
+  const { t } = useI18n();
   if (value === null || value === undefined || value === "") {
     return <p className="text-sm text-muted-foreground">—</p>;
   }
@@ -136,7 +138,7 @@ function StructuredValue({ value, depth = 0 }: { value: unknown; depth?: number
   }
   const entries = Object.entries(value as Record<string, unknown>);
   if (entries.length === 0) {
-    return <p className="text-sm text-muted-foreground">No artifact content available.</p>;
+    return <p className="text-sm text-muted-foreground">{t("No artifact content available.")}</p>;
   }
   return (
     <div className="flex flex-col">