Draw provider logos from the package, and fix main

[sivert-io]

main is red. #394 moved the client to @gryt/core 0.6.0, which brought three
new providers — makerworld, printables, thingiverse — and
check-embed-icons correctly failed because this app had no artwork for them.

Adding them to the old table would not have worked for all three: react-icons
has SiPrintables and SiThingiverse but no SiMakerworld. The package has
all 76 marks, so the artwork comes from there now — which is where it was headed
anyway.

What changed

LinkPreviewCard renders the path instead of a component:

const logo = provider ? getProviderLogo(provider.id) : undefined;
...
<svg className="link-embed-card-brand" viewBox={LOGO_VIEW_BOX} fill="currentColor" aria-hidden>
  <path d={logo} />
</svg>

.link-embed-card-brand already sets width: 15px, height: 15px and color,
so this draws exactly what react-icons drew — same 15px against the same 24×24
viewBox, same currentColor.

Two deletions worth arguing with

embedProviderIcons.ts — 108 lines and 73 react-icons/si imports, all now
in the package.

scripts/check-embed-icons.mjs — this guarded a seam its own comment
described: "the package owns the provider list, this app owns the artwork, and
the two can drift apart". That seam is what closed. Both sides live in the
package now, so they cannot drift, and core's logos.test.ts already asserts
every mark names a real provider. Keeping the check would mean keeping a file
whose only job is to compare the package against itself.

I checked the coverage it was protecting before deleting it: 76 providers, 76
logos, none missing, including the three that broke the build.

Not the whole icon story

react-icons stays installed. The 129 phosphor icons still come from
react-icons/pi, and SiKofi and FaGithub are in settings. Dropping the
dependency entirely is the follow-up, and it is worth 82 MB of every checkout
and nothing at all off the installer, since it is already a devDependency and
out of the asar.

Lint, typecheck and build pass.

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