feat(safety): report, block and hide chat lines (MODULE_API 1.21.0)

USER_SAFETY.md step 3, the module half of report, block and hide.

- server/safety.js registers the rust.chat report target (snapshot for one
  reader, null when they could not have seen the line; staff's hide and
  unhide) and the steam game identity (ownersOf from rust_account_links).
- The events feed filters chat per reader, in the query: lines from a
  blocked account's Steam ids, the reader's unlinked Steam-ID blocks and the
  lines they hid. Signed-in readers get canBlock on each chat line (false for
  their own and for staff-linked players). Lines staff hid for everyone are
  left out for everyone but staff, who get them with hidden: true.
- rust_events gains hidden_at and hidden_by (ALTER ... IF NOT EXISTS).
- POST /admin/rust/chat/:id/hide and /unhide (admin, moderator), logged.
- The feed's chat lines get a menu: Report, Hide for me, Block player,
  and for staff Hide for everyone / Show to everyone again.
- coreApi ^1.21.0; ci/core-ref.json pinned to the website#233 merge;
  routes.manifest.json and swagger-fragment.json regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

client/src/components/Feed.jsx

@@ -13,6 +13,7 @@
 
 import { ErrorState, Loading } from '../core.js'
 import Empty from './Empty.jsx'
+import ChatMenu from './ChatMenu.jsx'
 import { describe, FILTERS, kindsFor } from '../lib/feed.js'
 import { ago, clock } from '../lib/format.js'
 import usePolled from '../hooks/usePolled.js'
@@ -32,7 +33,7 @@ const TONE = {
 export default function Feed({ serverId, wipeId, filter, onFilter }) {
   const kinds = kindsFor(filter)
 
-  const { data, error, loading, at } = usePolled(
+  const { data, error, loading, at, refresh } = usePolled(
     () => api.servers.events(serverId, { kinds, wipe: wipeId, limit: 100 }),
     // The key is the QUESTION. Changing server, wipe or filter blanks the rows,
     // because what is on screen is an answer to a different one; a poll tick
@@ -111,10 +112,14 @@ export default function Feed({ serverId, wipeId, filter, onFilter }) {
                 key={event.id}
                 style={{
                   display: 'flex',
+                  flexWrap: 'wrap',
                   gap: 12,
                   alignItems: 'baseline',
                   padding: '7px 0',
                   borderBottom: '1px solid var(--line-soft, var(--line))',
+                  // Staff's hidden line (S10): only staff ever get one, dimmed
+                  // and marked so the hide can be checked and undone here.
+                  opacity: event.hidden ? 0.6 : 1,
                 }}
               >
                 <time
@@ -137,7 +142,17 @@ export default function Feed({ serverId, wipeId, filter, onFilter }) {
                       {line.detail}
                     </span>
                   )}
+                  {event.hidden && (
+                    <span className="sans" style={{ color: 'var(--mode-maint, #e6c26a)', fontSize: '0.74rem' }}>
+                      {' · '}
+                      Hidden by staff
+                    </span>
+                  )}
                 </span>
+                {/* Report, Hide for me, Block player, and staff's Hide for
+                    everyone (USER_SAFETY.md §4.2). The server filtered the feed
+                    for this reader, so after any of them the feed is re-read. */}
+                <ChatMenu line={event} onChanged={refresh} />
               </li>
             )
           })}