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/features/call/Controls.tsx

@@ -108,7 +108,9 @@ export function VideoButton({ enabled, onToggle, disabled }: VideoButtonProps) {
           onClick={() => onToggle()}
           outlined
           disabled={disabled}
-          aria-label={disabled ? 'Camera disabled in settings' : enabled ? 'Stop camera' : 'Start camera'}
+          aria-label={
+            disabled ? 'Camera disabled in settings' : enabled ? 'Stop camera' : 'Start camera'
+          }
           aria-pressed={enabled}
           style={disabled ? { opacity: 0.4, cursor: 'not-allowed' } : undefined}
         >