fix(polls): you can vote on a poll you just created (#284)

PollContent read mEvent.getId() once at render. For your own new poll
that is the local echo id (~!room:txn), and nothing re-rendered it when
the SDK swapped in the real $id, so the vote related to the local id
and the SDK threw synchronously (getPendingEvents under chronological
ordering): no vote was ever sent. Track the id via LocalEventIdReplaced
and Status, block voting while it is still local, and catch synchronous
throws. Adds the Playwright regression the issue asks for.

Fixes #284

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

e2e/local-homeserver.spec.ts

@@ -55,6 +55,52 @@ test.describe('local homeserver regression', () => {
     expect(console_.unexpected()).toEqual([]);
   });
 
+  test('you can vote on a poll you just created, without reloading (#284)', async ({ page }) => {
+    const console_ = collectConsole(page);
+    const room = await createRoom(alice, 'Poll Room');
+    await loginUI(page, alice);
+    await openRoom(page, room);
+    const question = uniq('Lunch? ');
+    await page.getByRole('button', { name: 'Create poll' }).first().click();
+    await page.getByPlaceholder('Ask a question…').fill(question);
+    await page.getByLabel('Option 1', { exact: true }).fill('Pizza');
+    await page.getByLabel('Option 2', { exact: true }).fill('Tacos');
+    await page.getByRole('button', { name: 'Create Poll' }).last().click();
+    const poll = page.locator('[data-message-id]', { hasText: question }).last();
+    await expect(poll).toBeVisible();
+    type Ev = {
+      type: string;
+      event_id: string;
+      content: { 'm.relates_to'?: { event_id?: string } };
+    };
+    const events = async () =>
+      (
+        await api<{ chunk: Ev[] }>(
+          'GET',
+          `/_matrix/client/v3/rooms/${enc(room)}/messages?dir=b&limit=10`,
+          alice.token,
+        )
+      ).chunk;
+    // Vote once the poll has reached the server (its row may still carry the local id).
+    await expect
+      .poll(async () => (await events()).some((e) => /poll\.start/.test(e.type)))
+      .toBe(true);
+    await poll.getByText('Tacos', { exact: true }).first().click();
+    await expect
+      .poll(async () => {
+        const chunk = await events();
+        const start = chunk.find((e) => /poll\.start/.test(e.type));
+        return chunk.some(
+          (e) =>
+            /poll\.response/.test(e.type) &&
+            e.content['m.relates_to']?.event_id === start?.event_id &&
+            start?.event_id.startsWith('$'),
+        );
+      })
+      .toBe(true);
+    expect(console_.unexpected()).toEqual([]);
+  });
+
   test('your own message scrolls into view even after scrolling up (#212)', async ({ page }) => {
     const room = await createRoom(alice, 'Scroll Room');
     await Array.from({ length: 40 }).reduce<Promise<unknown>>(