refactor(domain): split updateFeedRecord into renameFeed and editFeed

The inPlace boolean hid two distinct intentions. Replace it with two
intention-revealing operations backed by Feed.rename (presentational,
never touches expiry) and Feed.edit (full edit, recomputes expiry,
rejects expired). Add FeedRepository.saveConfig so these config-only
edits don't re-write (and risk clobbering) the email index.

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

src/routes/admin.tsx

@@ -9,7 +9,7 @@ import { logger } from "../lib/logger";
 import { timingSafeEqual, checkProxyAuth } from "../lib/auth";
 import { Layout, clampText } from "./admin/ui";
 import { FeedRepository } from "../domain/feed-repository";
-import { updateFeedRecord } from "../lib/feed-service";
+import { renameFeed } from "../lib/feed-service";
 import { feedRssUrl, feedAtomUrl, feedEmailAddress } from "../utils/urls";
 import { feedsRouter } from "./admin/feeds";
 import { emailsRouter } from "./admin/emails";
@@ -993,12 +993,7 @@ app.post(
       const { title, description } = c.req.valid("json");
 
       // In-place edit: only title/description, expiry untouched.
-      const result = await updateFeedRecord(
-        env,
-        feedId,
-        { title, description },
-        { inPlace: true },
-      );
+      const result = await renameFeed(env, feedId, { title, description });
 
       if (result.status === "not_found") {
         return c.json({ error: "Feed not found" }, 404);

src/routes/admin/feeds.tsx

@@ -12,7 +12,7 @@ import { purgeFeedKeysStep, collectUnsubscribeUrls } from "./helpers";
 import { FeedRepository } from "../../domain/feed-repository";
 import {
   createFeedRecord,
-  updateFeedRecord,
+  editFeed,
   deleteFeedRecord,
   deleteFeedFastDetailed,
 } from "../../lib/feed-service";
@@ -329,7 +329,7 @@ feedsRouter.post("/:feedId/edit", async (c) => {
       blockedSenders,
     });
 
-    const result = await updateFeedRecord(env, feedId, {
+    const result = await editFeed(env, feedId, {
       title: parsedData.title,
       description: parsedData.description,
       language: parsedData.language,

src/routes/api/index.ts

@@ -5,7 +5,7 @@ import { Env, FeedConfig } from "../../types";
 import { apiAuthMiddleware } from "../../lib/auth";
 import {
   createFeedRecord,
-  updateFeedRecord,
+  editFeed,
   deleteFeedRecord,
 } from "../../lib/feed-service";
 import { deleteAttachmentsForEmails } from "../admin/helpers";
@@ -203,7 +203,7 @@ apiApp.openapi(
     const env = c.env;
     const { feedId } = c.req.valid("param");
     const body = c.req.valid("json");
-    const result = await updateFeedRecord(env, feedId, {
+    const result = await editFeed(env, feedId, {
       title: body.title,
       description: body.description,
       language: body.language,