(cherry picked from commit d10fdfe9738b17a9d81037c031b40a2cc4cb8038)
* SP-2025-03.1 always wrap icon&thumbnail URLs
if they're not HTTP URLs, the frontend won't be able to display them
anyway (`<img src="mailto:…">` or '<div stile="background-image:
url(nntp:…)">` aren't going to work!), so let's always run them through the
media proxy, which will fail harder (fetching a `javascript:` URL
won't do anything in the backend, might do something in the frontend)
and will always protect the client's address in cases like `gemini:`
where the browser could try to fetch
* SP-2025-03.2 use object binding for more styles
interpolating a random (remote-controlled!) string into a `style`
attribute is a bad idea; using VueJS object binding, we should get
proper quoting and therefore safe parse failures instead of CSS
injections / XSS
* SP-2025-03.3 slightly more robust "self" URL handling
parse URLs instead of treating them as strings; this is still not
perfect, but the `URL` class only handles full URLs, not relative
ones, so there's so way to ask it "give me a URL object that
represents this resource relative to this base URL"
notice that passing very weird URLs to `MkUrl` and `MkUrlPreview` will
break the frontend (in dev mode) because there's an untrapped `new
URL(…)` that may explode; production builds seem to safely ignore the
error, though
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Co-authored-by: Julia <julia@insertdomain.name>
Co-authored-by: dakkar <dakkar@thenautilus.net>
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