docs(release): sync 1.49.0 CHANGELOG, What's New, and credits (#1211)

Set the 1.49.0 release date, fix Added PR order for Polish (#1185),
refresh WHATS_NEW highlights for missing user-facing fixes, and credit
ImAsra for WinGet release automation (#1077).

src/config/settingsCredits.ts

@@ -401,6 +401,7 @@ const CONTRIBUTOR_ENTRIES = [
     since: '1.47.0',
     contributions: [
       'Long-press album Play to shuffle with hold progress animation (PR #888)',
+      'WinGet release automation — GitHub Actions workflow that opens manifest PRs on each release (PR #1077)',
     ],
   },
   {