Show a thread reply count on its opening post

e2e/USER_STORIES.md

@@ -727,7 +727,7 @@ so that responses connect to the right thing.
 Acceptance:
 
 - "Reply to thread" opens a composer with no quoted parent, and submitting
-  appends a post and increments the reply count in the header.
+  appends a post and increments the reply count on the opening post.
 - "Reply" on a single post shows "Replying to" that post, which can be cleared
   before submitting.
 - A reply to a thread in a room is tagged into that room, so the relay handles

e2e/specs/articles-threads.spec.ts

@@ -754,8 +754,8 @@ test("US-043 reply to a thread and to a specific post", async ({seed, as}) => {
   await expect(openingPost.getByText("OP", {exact: true})).toBeVisible()
   await expect(bob.getByText("20 replies")).toBeVisible()
 
-  // The page bar carries the title, so the opening post does not repeat it.
-  await expect(bob.getByText("Bed rotation")).toHaveCount(1)
+  // The opening post carries the title, and the summary bar replaces it once it scrolls away.
+  await expect(openingPost).toContainText("Bed rotation")
 
   await bob.getByRole("button", {name: "Reply to thread"}).click()
 
@@ -975,6 +975,6 @@ test("US-045 turn a chat message into a thread", async ({seed, as}) => {
 
   await row.click()
 
-  await expect(page.getByRole("heading", {name: "Deploy failures"})).toBeVisible()
+  await expect(page.locator("article").filter({hasText: "Deploy failures"})).toBeVisible()
   await expect(page.getByText("the deploy broke again")).toBeVisible()
 })

e2e/specs/content-rendering.spec.ts

@@ -393,7 +393,7 @@ test("US-065 see quoted and embedded content", async ({seed, as}) => {
 
   await page.waitForURL(next => next.pathname === `${spacePath(url)}/threads/${thread.id}`)
 
-  await expect(page.getByRole("heading", {name: "Roadmap for Q3"})).toBeVisible()
+  await expect(page.locator(`[data-event="${thread.id}"]`)).toContainText("Roadmap for Q3")
 })
 
 test("US-066 see distinctive inline tokens", async ({seed, as}) => {

e2e/specs/notifications.spec.ts

@@ -791,7 +791,7 @@ test("US-112 see which threads are unread", async ({seed, as}) => {
 
   await hers.click()
 
-  await expect(pageBar(bob)).toContainText("the server is on fire")
+  await expect(bob.locator("article").filter({hasText: "the server is on fire"})).toBeVisible()
 
   // Opening a thread is what marks it read, so only the one he opened loses its dot
   await bob.goBack()

src/app/components/ThreadPost.svelte

@@ -25,9 +25,10 @@
     threadPubkey: string
     onReply: (event: TrustedEvent) => void
     context: FeedContext
+    replyCount?: number
   }
 
-  const {url, event, threadPubkey, onReply, context}: Props = $props()
+  const {url, event, threadPubkey, onReply, context, replyCount}: Props = $props()
 
   const profileDisplay = $profiles.display(event.pubkey, [url]).$
   const handle = $handles.forPubkey(event.pubkey).$
@@ -69,7 +70,13 @@
       <div
         class="bg-surface flex flex-wrap items-center justify-between gap-2 border-b px-3 py-2 text-xs @lg:px-4 @lg:text-sm"
         style="border-color: var(--line)">
-        <span class="opacity-75">{formatTimestamp(event.created_at)}</span>
+        <div class="flex items-center gap-2 opacity-75">
+          <span>{formatTimestamp(event.created_at)}</span>
+          {#if replyCount !== undefined}
+            <span>·</span>
+            <span>{replyCount} {replyCount === 1 ? "reply" : "replies"}</span>
+          {/if}
+        </div>
         <Button
           class="button button-ghost button-xs h-auto min-h-0 gap-1 px-1 py-0"
           onclick={copyPermalink}>

src/routes/spaces/[relay]/threads/[id]/+page.svelte

@@ -174,6 +174,7 @@
             {context}
             event={$event}
             threadPubkey={$event.pubkey}
+            replyCount={$replies.length}
             onReply={openReply} />
         </div>
         {#if hiddenCount > 0}