build: bundle the fonts the placeholder pane will need

Groundwork for item 30, the blank right pane. Nothing references these
yet; the pane itself is the next piece of work.

The pane is drawn from the user's own HTML mockup, which sets its
wordmark in Oxanium and its text in IBM Plex Sans and pulls both from
Google Fonts. That @import cannot work here: the web view's interceptor
blocks every request by default, deliberately, and neither font is
installed on the development machine either. Shipping them is what
makes the pane look the same on every machine.

Both are SIL OFL 1.1, which permits redistribution and is compatible
with the GPL, and each carries its licence text beside it. The README
records the pairing.

Both are subsets, since they are embedded into the rendered document as
data URIs and the full families would dwarf the page using them.
Oxanium is instanced to weight 800 and cut to the nine characters of
the wordmark: 43K to 1.2K. IBM Plex Sans is cut to Latin-1 plus common
punctuation rather than to the exact strings in use: 525K to 13K. The
wider cut is deliberate, because that font carries interface text that
will change, and a subset matching only today's wording would break
silently the moment a string is edited. Coverage of both was verified
against the strings they have to draw.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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