docs(design): remove SVG, use PNG logo only

SVG icon is no longer in use. public/logo.png (1024x1024 RGBA) is
the single logo asset. DESIGN.md updated accordingly: SVG snippet
removed, wordmark pattern and <head> references updated to PNG.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

node_modules/.bin/autoprefixer

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+../autoprefixer/bin/autoprefixer

node_modules/.bin/baseline-browser-mapping

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+../baseline-browser-mapping/dist/cli.cjs

node_modules/.bin/browserslist

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+../browserslist/cli.js

node_modules/.bin/cssesc

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+../cssesc/bin/cssesc

node_modules/.bin/esbuild

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+../esbuild/bin/esbuild

node_modules/.bin/jiti

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+../jiti/bin/jiti.js

node_modules/.bin/jsesc

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+../jsesc/bin/jsesc

node_modules/.bin/json5

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+../json5/lib/cli.js

node_modules/.bin/loose-envify

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+../loose-envify/cli.js

node_modules/.bin/nanoid

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+../nanoid/bin/nanoid.cjs

node_modules/.bin/parser

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+../@babel/parser/bin/babel-parser.js

node_modules/.bin/resolve

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+../resolve/bin/resolve

node_modules/.bin/rollup

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+../rollup/dist/bin/rollup

node_modules/.bin/semver

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+../semver/bin/semver.js

node_modules/.bin/sucrase

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+../sucrase/bin/sucrase

node_modules/.bin/sucrase-node

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+../sucrase/bin/sucrase-node

node_modules/.bin/tailwind

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+../tailwindcss/lib/cli.js

node_modules/.bin/tailwindcss

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+../tailwindcss/lib/cli.js

node_modules/.bin/tsc

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+../typescript/bin/tsc

node_modules/.bin/tsserver

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+../typescript/bin/tsserver

node_modules/.bin/update-browserslist-db

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+../update-browserslist-db/cli.js

node_modules/.bin/vite

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+../vite/bin/vite.js