feat: consolidate database management work

Add catalog-owned logical relationships and runtime snapshots, extend the database-management UI and validation coverage, and document the updated operational workflow.

Keep active sensitive-generation status in a tooltip and indicator, and update the layout E2E to follow the history action in its new database-scoped location.

frontend/src/shell/database-management/FleetActionSelector.typography.test.ts

@@ -0,0 +1,30 @@
+import { readFileSync, readdirSync } from "node:fs";
+
+import { expect, test } from "vitest";
+
+const sourceDirectory = "src/shell/database-management";
+const styles = readFileSync(`${sourceDirectory}/FleetLedgerShell.css`, "utf8");
+
+test("uses operational body text for every available-command list", () => {
+  const availableCommandLists = readdirSync(sourceDirectory)
+    .filter((fileName) => fileName.endsWith(".tsx") && !fileName.includes(".test."))
+    .flatMap((fileName) => {
+      const source = readFileSync(`${sourceDirectory}/${fileName}`, "utf8");
+      const matches = source.match(
+        /<select\b[\s\S]*?<option value="">Choose an action…<\/option>[\s\S]*?<\/select>/g,
+      );
+      return (matches ?? []).map((markup) => ({ fileName, markup }));
+    });
+
+  expect(availableCommandLists.map(({ fileName }) => fileName).sort()).toEqual([
+    "DatabaseRelationships.tsx",
+    "FleetActionSelector.tsx",
+  ]);
+  for (const { markup } of availableCommandLists) {
+    expect(markup).toContain('className="thot-fleet-action-selector__select"');
+  }
+
+  expect(styles).toMatch(
+    /\.thot-fleet-action-selector__select\s*\{[^}]*font-size:\s*0\.9375rem;/s,
+  );
+});