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/url-preview/UrlPreview.tsx

@@ -4,7 +4,13 @@ import { Box, as } from 'folds';
 import * as css from './UrlPreview.css';
 
 export const UrlPreview = as<'div'>(({ className, ...props }, ref) => (
-  <Box shrink="No" data-url-preview="" className={classNames(css.UrlPreview, className)} {...props} ref={ref} />
+  <Box
+    shrink="No"
+    data-url-preview=""
+    className={classNames(css.UrlPreview, className)}
+    {...props}
+    ref={ref}
+  />
 ));
 
 export const UrlPreviewImg = as<'img'>(({ className, alt, ...props }, ref) => (