feat(webui): open contextual configured handbooks

webui/tests/help-context.test.ts

@@ -0,0 +1,18 @@
+import { helpContextForPathname } from "../src/utils/helpContext";
+
+function assertEqual(actual: string, expected: string, message: string): void {
+  if (actual !== expected) throw new Error(`${message}: expected ${expected}, got ${actual}`);
+}
+
+assertEqual(helpContextForPathname("/files").id, "files.list", "Files context");
+assertEqual(helpContextForPathname("/mail").id, "mail.list", "Mail context");
+assertEqual(
+  helpContextForPathname("/settings", "?section=mail-profiles").id,
+  "mail.profiles",
+  "Mail profile settings context"
+);
+assertEqual(
+  helpContextForPathname("/campaigns/campaign-1/attachments").id,
+  "campaign.attachments",
+  "Campaign attachment context"
+);