feat: rebrand app and packaging icons to new Motionity logo

Swap the small icon mark, README banner, packaged app icon, and
favicon over to the new brand assets. make-icon.cjs and the new
make-favicon.cjs re-derive their bar geometry/colours from
src/assets/logo.svg instead of the old white-bars mark.

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

src/assets/logo-full.svg

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