feat: consolidate shared UI and harden browser authority for release

webui/tests/mail-components.test.tsx

@@ -19,9 +19,28 @@ import MessageDisplayPanel, { buildSafeMessageHtmlDocument } from "../src/compon
 import MailServerSettingsPanel, { MailServerFolderLookupResultView, mailImapSettingsPayload, normalizeMailImapFolderMappings, resolveMailServerSettingsActiveSection } from "../src/components/mail/MailServerSettingsPanel";
 import EmailAddressInput from "../src/components/email/EmailAddressInput";
 import { PlatformLanguageProvider } from "../src/i18n/LanguageContext";
+import { dedupeAddresses } from "../src/utils/emailAddresses";
 
 function noop() {}
 
+const orderedAddresses = [
+  { name: "Zulu", email: " ZULU@example.test " },
+  { email: "alpha@example.test" },
+  { name: "Alpha", email: "ALPHA@example.test" },
+  { name: "Beta", email: "beta@example.test" }
+];
+assertDeepEqual(
+  dedupeAddresses(orderedAddresses).map((item) => item.name),
+  ["Alpha", "Beta", "Zulu"],
+  "address suggestion consumers retain the alphabetical default"
+);
+assertDeepEqual(dedupeAddresses(orderedAddresses, { preserveOrder: true }), [
+  { name: "Zulu", email: "zulu@example.test" },
+  { name: "Alpha", email: "alpha@example.test" },
+  { name: "Beta", email: "beta@example.test" }
+], "authored recipient order is preserved while duplicates enrich the first occurrence");
+assertEqual(orderedAddresses[0].email, " ZULU@example.test ", "deduplication does not mutate its input");
+
 const allMailServerSections = ["smtp", "imap"] as const;
 assertEqual(
   resolveMailServerSettingsActiveSection("imap", "smtp", "smtp", allMailServerSections),