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/plugins/react-custom-html-parser.tsx

@@ -462,7 +462,9 @@ export const getReactCustomHtmlParser = (
               {...props}
               role="button"
               tabIndex={0}
-              onKeyDown={(e) => { if (e.key === 'Enter' || e.key === ' ') params.handleSpoilerClick?.(e as any); }}
+              onKeyDown={(e) => {
+                if (e.key === 'Enter' || e.key === ' ') params.handleSpoilerClick?.(e as any);
+              }}
               onClick={params.handleSpoilerClick}
               className={css.Spoiler()}
               aria-label="Spoiler — click to reveal"