Adds the vector source-of-truth for the v0.42.0 brand refresh:
- lockup.svg / lockup-light.svg: the wordmark + mark combination,
light and light/dark variants
- mark.svg / mark-mono.svg: the standalone mark, colour and mono
- social-preview.svg: 1200x630 Open Graph / oEmbed card
These are the assets the new BrandMark / BrandWordmark / BrandLockup
components (commit 3 of this batch) consume, and the assets the
favicon / PWA manifest (commit 4) reference. They replace the
PNG-only brand directory committed in dfee7f9 with a vector
first-class set; PNG derivatives stay in the same dir for legacy
favicon / PWA paths.
This is the first commit in the v0.42.0 working-tree follow-up; the
previous v0.42.0 brand refresh landed as 9 commits (dfee7f9..3de91af)
in the prior round.
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