hardening: add sandbox CSP for HTML email viewer#6141
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We already have JavaScript disabled, and we don't need any of the `allow-...` values: https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/sandbox. I have checked that it still shows some email messages properly, and "Load remote content" also works. Clicking on links also works as usual. But I didn't check this on Tauri.
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We already have JavaScript disabled, and we don't need
any of the
allow-...values:https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/sandbox.
I have checked that it still shows some email messages properly,
and "Load remote content" also works.
Clicking on links also works as usual.
But I didn't check this on Tauri.