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/PrescreenControls.tsx

@@ -75,7 +75,10 @@ export function PrescreenControls({ canJoin }: PrescreenControlsProps) {
       </Box>
       <Box grow="Yes" direction="Column" gap="200">
         {micDenied && (
-          <Text size="T200" style={{ color: 'var(--tc-critical-high, #e53e3e)', textAlign: 'center' }}>
+          <Text
+            size="T200"
+            style={{ color: 'var(--tc-critical-high, #e53e3e)', textAlign: 'center' }}
+          >
             Microphone access is blocked. Enable it in your browser settings to join.
           </Text>
         )}