Clarify remaining native playback validation scope

docs/MEDIA-PREVIEW.md

@@ -43,7 +43,7 @@ invalid paths, deletion, unindexed files, same-size/time replacement identity,
 durable same-stat hint invalidation and actual renamed PNG format/MIME.
 All 59 frontend tests passed, including opaque-token rejection and same-path
 index-refresh invalidation. Format checking and production frontend build passed.
-These checks do not prove WebView playback or macOS/Linux protocol behavior.
+These checks do not prove native WebView playback or macOS protocol behavior.
 The locked native suite, strict all-target Clippy and Rust formatting checks
 passed after the final native edits. No model inference or GPU test was needed
 for these protocol regressions.