fix(review-2): address re-review — close two blocker regressions + harden tests

The round-2 re-review (full suite green) found two real defects the passing
tests missed, both now fixed and covered:

B1 — banned users could still edit/delete their OWN content: edit_upload,
     delete_upload, delete_comment skipped the is_banned guard that upload/
     like/comment got (round-2 removed the global extractor block and missed
     these three). Added the guard (using auth.is_banned — no extra query).
     The moderation ban test now asserts 403 on DELETE upload, PATCH upload,
     and DELETE comment for a banned owner (+ upload survives) — it previously
     only exercised POST /upload, which is why the gap shipped green.

B2 — H3 live-eviction was dead code: 'user-hidden' and 'comment-deleted' were
     missing from KNOWN_EVENTS, so EventSource never listened and the handlers
     never fired. Added both. New browser-driven sse-eviction test asserts a
     hidden user's card actually evicts from an open feed with no reload — the
     backend-only SseListener checks couldn't catch this.

Minor items folded in:
- admin dashboard bounces a mid-session-demoted admin to /feed via live
  /me/context (mirrors the host page) instead of a dead error screen.
- feed "new posts" pill cleared on any full refresh (pull-to-refresh no longer
  strands it).
- corrected the stale sse.rs comment (banned users may hold a read-only stream).

Verified: backend 35 unit tests; svelte-check 0 errors; e2e 04-host + comment-ui
+ export-leak 13/13 on chromium (incl. the two new regression tests).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/src/handlers/social.rs

@@ -199,6 +199,10 @@ pub async fn delete_comment(
     auth: AuthUser,
     Path(comment_id): Path<Uuid>,
 ) -> Result<StatusCode, AppError> {
+    // Banned users keep read access but cannot mutate (USER_JOURNEYS §10).
+    if auth.is_banned {
+        return Err(AppError::Forbidden("Du bist gesperrt.".into()));
+    }
     let comment = Comment::find_by_id(&state.pool, comment_id)
         .await?
         .ok_or_else(|| AppError::NotFound("Kommentar nicht gefunden.".into()))?;

backend/src/handlers/sse.rs

@@ -48,10 +48,10 @@ pub async fn stream(
         .consume(&q.ticket)
         .ok_or_else(|| AppError::Unauthorized("Ticket ungültig oder abgelaufen.".into()))?;
 
-    // NOTE: this authenticates via ticket→session, not the `AuthUser` extractor, so
-    // it does not re-check `is_banned`. A user banned mid-stream keeps receiving
-    // events until the connection drops; they cannot reconnect (issue_ticket uses
-    // AuthUser, which rejects banned users). Documented in docs/SECURITY-BACKLOG.md.
+    // NOTE: this authenticates via ticket→session, not the `AuthUser` extractor. The
+    // SSE stream is read-only, and under the read-only-ban model (USER_JOURNEYS §10)
+    // banned users retain read access — so both minting a ticket and holding a stream
+    // open are intentionally allowed for banned users; only writes are blocked.
     Session::find_by_token_hash(&state.pool, &token_hash)
         .await
         .map_err(|e| AppError::Internal(e.into()))?

backend/src/handlers/upload.rs

@@ -272,6 +272,10 @@ pub async fn edit_upload(
     Path(upload_id): Path<Uuid>,
     Json(body): Json<EditUploadRequest>,
 ) -> Result<StatusCode, AppError> {
+    // Banned users keep read access but cannot mutate (USER_JOURNEYS §10).
+    if auth.is_banned {
+        return Err(AppError::Forbidden("Du bist gesperrt.".into()));
+    }
     let upload = Upload::find_by_id_and_event(&state.pool, upload_id, auth.event_id)
         .await?
         .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
@@ -303,6 +307,10 @@ pub async fn delete_upload(
     auth: AuthUser,
     Path(upload_id): Path<Uuid>,
 ) -> Result<StatusCode, AppError> {
+    // Banned users keep read access but cannot mutate (USER_JOURNEYS §10).
+    if auth.is_banned {
+        return Err(AppError::Forbidden("Du bist gesperrt.".into()));
+    }
     let upload = Upload::find_by_id_and_event(&state.pool, upload_id, auth.event_id)
         .await?
         .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;

e2e/specs/04-host/moderation.spec.ts

@@ -4,6 +4,7 @@
  * coverage of the buttons lives in a separate UI-focused spec.
  */
 import { test, expect } from '../../fixtures/test';
+import { seedUpload, seedComment } from '../../helpers/seed';
 
 test.describe('Host — moderation API', () => {
   test('ban with hide_uploads=true sets the right flags', async ({ api, host, guest }) => {
@@ -104,20 +105,52 @@ test.describe('Host — live role/ban revocation (H1)', () => {
   test('a banned user keeps read access but is blocked from writes', async ({ api, host, guest }) => {
     const base = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
     const target = await guest('BannedRW');
+    const auth = (jwt: string) => ({ Authorization: `Bearer ${jwt}` });
+
+    // Seed content the target OWNS *before* the ban, so the delete/edit paths get
+    // past the ownership check and it's genuinely the ban guard being exercised.
+    const ownUpload = await seedUpload(target.jwt, { caption: 'mine' });
+    const ownComment = await seedComment(target.jwt, ownUpload, 'my comment');
+
     await api.banUser(host.jwt, target.userId, false);
 
     // Reads still succeed.
-    const read = await fetch(base + '/api/v1/me/context', {
-      headers: { Authorization: `Bearer ${target.jwt}` },
-    });
+    const read = await fetch(base + '/api/v1/me/context', { headers: auth(target.jwt) });
     expect(read.status).toBe(200);
 
-    // Writes are rejected.
-    const write = await fetch(base + '/api/v1/upload', {
+    // Every write is rejected — cover ALL guest-reachable mutations, not just
+    // /upload. delete_upload / delete_comment / edit_upload previously skipped the
+    // ban guard (a banned owner could still delete/edit their own content).
+    const create = await fetch(base + '/api/v1/upload', {
       method: 'POST',
-      headers: { Authorization: `Bearer ${target.jwt}` },
+      headers: auth(target.jwt),
       body: new FormData(),
     });
-    expect(write.status).toBe(403);
+    expect(create.status).toBe(403);
+
+    const delUpload = await fetch(base + `/api/v1/upload/${ownUpload}`, {
+      method: 'DELETE',
+      headers: auth(target.jwt),
+    });
+    expect(delUpload.status).toBe(403);
+
+    const editUpload = await fetch(base + `/api/v1/upload/${ownUpload}`, {
+      method: 'PATCH',
+      headers: { ...auth(target.jwt), 'Content-Type': 'application/json' },
+      body: JSON.stringify({ caption: 'edited while banned' }),
+    });
+    expect(editUpload.status).toBe(403);
+
+    const delComment = await fetch(base + `/api/v1/comment/${ownComment}`, {
+      method: 'DELETE',
+      headers: auth(target.jwt),
+    });
+    expect(delComment.status).toBe(403);
+
+    // The upload survived every blocked write (still fetchable via the feed).
+    const feed = await fetch(base + '/api/v1/feed', { headers: auth(host.jwt) });
+    const body = await feed.json();
+    const rows = body.uploads ?? body.items ?? body;
+    expect(Array.isArray(rows) && rows.some((u: any) => u.id === ownUpload)).toBe(true);
   });
 });

e2e/specs/04-host/sse-eviction.spec.ts

@@ -48,4 +48,28 @@ test.describe('Host — live SSE eviction (H3)', () => {
       (e) => e.data.user_id === target.userId
     );
   });
+
+  // Frontend regression: the broadcasts above are inert if the client never
+  // registers the event name (the KNOWN_EVENTS gap that shipped both eviction
+  // handlers as dead code). Drive a real browser feed and assert LIVE eviction —
+  // this fails if 'user-hidden' is missing from KNOWN_EVENTS, unlike the
+  // backend-only SseListener checks above.
+  test('a hidden user is evicted from an open feed without reload (frontend)', async ({
+    page,
+    api,
+    host,
+    guest,
+    signIn,
+  }) => {
+    const viewer = await guest('LiveEvictViewer');
+    const target = await guest('LiveEvictTarget');
+    await seedUpload(target.jwt, { caption: 'evict-me-live-xyz' });
+
+    await signIn(page, viewer); // lands on the event-wide /feed
+    await expect(page.getByText('evict-me-live-xyz').first()).toBeVisible();
+
+    // Host hides the target — the viewer's feed must drop the card via SSE, no reload.
+    await api.banUser(host.jwt, target.userId, true);
+    await expect(page.getByText('evict-me-live-xyz')).toHaveCount(0, { timeout: 15_000 });
+  });
 });

frontend/src/lib/sse.ts

@@ -38,6 +38,8 @@ const KNOWN_EVENTS = [
 	'upload-deleted',
 	'like-update',
 	'new-comment',
+	'comment-deleted',
+	'user-hidden',
 	'event-closed',
 	'event-opened',
 	'event-updated',

frontend/src/routes/admin/+page.svelte

@@ -158,8 +158,22 @@
 
 	onMount(async () => {
 		const token = getToken();
-		const role = getRole();
-		if (!token || role !== 'admin') {
+		if (!token) {
+			goto('/admin/login');
+			return;
+		}
+		// Trust the *live* role, not the JWT claim: a mid-session demote leaves a
+		// stale 'admin' in the token, but the backend now 403s every admin call.
+		// Bounce a demoted admin to the feed instead of leaving them on a dashboard
+		// that errors on load (mirrors the host page).
+		try {
+			const ctx = await api.get<{ role: string }>('/me/context');
+			if (ctx.role !== 'admin') {
+				goto('/feed');
+				return;
+			}
+		} catch {
+			// Expired/invalid session (api.ts cleared it) — send them to re-auth.
 			goto('/admin/login');
 			return;
 		}

frontend/src/routes/feed/+page.svelte

@@ -317,6 +317,10 @@
 	}
 
 	async function loadFeed(refresh = false) {
+		// Any full refresh (pill tap, pull-to-refresh, filter change) resyncs page 1,
+		// so the "new posts" pill is no longer relevant — clear it here rather than
+		// only in the pill's own onclick, or a pull-to-refresh leaves it stranded.
+		if (refresh) feedStale = false;
 		try {
 			const params = new URLSearchParams();
 			if (!refresh && nextCursor) params.set('cursor', nextCursor);