Omera v0.4.8

Fixed

• Check for updates through the native backend so WebView CSP and cross-origin
  restrictions cannot block the GitHub API or latest-release redirect fallback.
• Use the current Windows manual system proxy for update checks and signed
  downloads, with explicit proxy environment variables taking precedence. Proxy
  changes take effect on the next request without restarting the application.
• Bound update metadata requests and preserve useful network diagnostics while
  retaining HTTPS enforcement and installer signature verification.

Release testing

The updater fix passed the frontend build, 306 frontend regressions, workspace
Rust checks and live GitHub API/fallback requests using Windows proxy settings.
The existing native installed-update acceptance limitations from 0.4.7 remain;
this patch does not claim completion of the installed-platform matrix (#256).
PAC/WPAD and proxy bypass lists are not supported by the native update client.

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For complete release details and commit history, see CHANGELOG.md.