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/room/CallChatView.tsx

@@ -41,7 +41,12 @@ export function CallChatView() {
               }
             >
               {(triggerRef) => (
-                <IconButton ref={triggerRef} variant="Surface" onClick={handleClose} aria-label="Close call chat">
+                <IconButton
+                  ref={triggerRef}
+                  variant="Surface"
+                  onClick={handleClose}
+                  aria-label="Close call chat"
+                >
                   <Icon src={Icons.Cross} />
                 </IconButton>
               )}