Fix Twitter URL facet replacement

[rosethornbush]

Summary\n- Replace Twitter URL facets exactly once, preferring the original URL text when present\n- Prevent expanded URL replacements from being processed again via display text and producing duplicated prefixes/slashes\n\n## Validation\n- Targeted Twitter transform reproduction for the Notion Status URL\n- pnpm exec tsc -p packages/platforms/tsconfig.json --noEmit\n- oxlint packages/platforms/src/platforms/twitter.ts\n- pnpm --filter @embedly/platforms exec oxfmt --check src/platforms/twitter.ts

[changeset-bot]

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