consistent handling of logo across formats

[gordonwoodhull]

Description

Thought I'd open a discussion instead of an issue, because this is something that does work, but it works differently across formats.

I think the formats have a path for convergence, but it can happen over time and they may not need to converge completely.

Summary

We have mostly consistent behavior of brand.logo across formats, but we haven't revisited the older base logo metadata.

• In html, logo is ignored
• In dashboard and revealjs, logo specifies a path which supercedes brand.logo, and objects or brand.logo resource names generate 404 errors and broken image icon
• In typst, logo can be a path or brand.logo resource name, or it can be an object containing any of path, padding, width, location

Consequences

I think it's likely that people will ask why they can't use a brand.logo resource name for html/dashboard/revealjs, and other features may also bleed out from typst.

Right now, the negative consequence is that if you specify e.g.

logo: large

results will be inconsistent across between formats, with typst using that logo, dashboard/revealjs doing 404 and broken image icon, and html ignoring it.

Likewise the object form

logo:
  path: large

uses that logo in typst, generates 404 and broken image icon in dashboard and revealjs, and has no effect in html.

(brand yaml itself is consistent)