chore: prettier format all files, brotli, Sentry release tagging, CI gates

Prettier: auto-formatted 103 files to fix baseline. Prettier check in CI
  is now a hard gate (removed continue-on-error).

Brotli: installed libnginx-mod-http-brotli-filter/static. Enabled in nginx
  with brotli_static on for pre-compressed assets and comp_level 6.

Sentry releases: deploy script now exports VITE_APP_VERSION=<git-short-sha>
  before building so each Sentry release maps to an exact commit.
  CI also passes github.sha as VITE_APP_VERSION.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/components/message/content/FallbackContent.tsx

@@ -8,7 +8,9 @@ export const MessageDeletedContent = as<'div', { children?: never; reason?: stri
   ({ reason, ...props }, ref) => (
     <Box as="span" alignItems="Center" gap="100" style={warningStyle} {...props} ref={ref}>
       <Icon size="50" src={Icons.Delete} />
-      <i>{reason ? `This message has been deleted — ${reason}` : 'This message has been deleted'}</i>
+      <i>
+        {reason ? `This message has been deleted — ${reason}` : 'This message has been deleted'}
+      </i>
     </Box>
   )
 );