release: v2.8.3-beta Security policy fixes for the web app

docs/releases/v2.8.3-beta.md

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+This release fixes the security headers added in v2.8.2-beta, which blocked parts of the web app in the browser.
+
+## Improvements and fixes
+
+- The web app's icons now display again. They are bundled into the app instead of being fetched from an external icon service, which the security policy blocked.
+- The light and dark mode script in the page is now allowed by the security policy, so the color mode no longer fails to apply on load.
+- The security policy now allows WebAssembly, which parts of the web app need.
+
+## Under the hood
+
+- Add a Vite plugin that bundles only the Lucide icons the app uses.
+- Compute a hash for each inline script in the served page and add it to the `script-src` directive, instead of allowing inline scripts in general.
+- Update the security headers tests.
+
+## Upgrading
+
+- Replace the binary, or pull the new image. No schema change and no new environment variable.
+- If you are on v2.8.2-beta, upgrade: that version's policy broke icons and color mode.