feat(feed): optional per-feed sender-in-title toggle

Add a per-feed senderInTitle flag (domain FeedState.senderInTitle ↔
FeedConfig.sender_in_title). When set, the feed generator prefixes each
entry title with [Sender] (display name, falling back to the address).
Exposed as an admin edit-form checkbox and across the REST API
create/update/response schemas.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/infrastructure/feed-generator.test.ts

@@ -147,6 +147,37 @@ describe("generateRssFeed", () => {
     expect(result).not.toContain("<item>");
   });
 
+  it("leaves the item title unprefixed by default", () => {
+    const result = generateRssFeed(
+      mockFeedConfig,
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
+    expect(result).toContain("Hello World");
+    expect(result).not.toContain("[Alice]");
+  });
+
+  it("prefixes the item title with the sender when sender_in_title is set", () => {
+    const result = generateRssFeed(
+      { ...mockFeedConfig, sender_in_title: true },
+      mockEmails,
+      BASE_URL,
+      FEED_ID,
+    );
+    expect(result).toContain("[Alice] Hello World");
+  });
+
+  it("falls back to the email address when the sender has no display name", () => {
+    const result = generateRssFeed(
+      { ...mockFeedConfig, sender_in_title: true },
+      [{ ...mockEmails[0], from: "bob@example.com" }],
+      BASE_URL,
+      FEED_ID,
+    );
+    expect(result).toContain("[bob@example.com] Hello World");
+  });
+
   it("feed link points to the public read URL, never an admin path", () => {
     const result = generateRssFeed(
       mockFeedConfig,

src/infrastructure/feed-generator.ts

@@ -74,8 +74,12 @@ function buildFeed(
       baseUrl,
       EmailAddress.parse(email.from)?.siteBaseUrl() ?? "",
     );
+    const subject = htmlToText(email.subject);
+    const title = feedConfig.sender_in_title
+      ? `[${parseFromAddress(email.from).name ?? email.from}] ${subject}`
+      : subject;
     feed.addItem({
-      title: htmlToText(email.subject),
+      title,
       id: entryUrl,
       link: entryUrl,
       description: bodyContent,

src/infrastructure/feed-mapper.ts

@@ -18,6 +18,7 @@ export function fromConfigDTO(dto: FeedConfig): FeedState {
     language: dto.language,
     mailboxId: dto.mailbox_id,
     author: dto.author,
+    senderInTitle: dto.sender_in_title,
     allowedSenders: dto.allowed_senders ?? [],
     blockedSenders: dto.blocked_senders ?? [],
     createdAt: dto.created_at,
@@ -34,6 +35,7 @@ export function toConfigDTO(state: FeedState): FeedConfig {
     language: state.language,
     mailbox_id: state.mailboxId,
     author: state.author,
+    sender_in_title: state.senderInTitle,
     allowed_senders: state.allowedSenders,
     blocked_senders: state.blockedSenders,
     created_at: state.createdAt,