perf: lazy load homepage embeds - #632
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Summary
Fixes #217.
This PR reduces homepage mobile Lighthouse pressure by deferring two expensive third-party/embed surfaces from the initial page load:
headTagsand loads it after browser idle timednt=1handling when the iframe is createdValidation
npm.cmd cinpm.cmd run buildnpm.cmd run typecheckstill fails on existing unrelated repository type issues (publish-externals/generated/graphql, GraphiQL/DocSearch/Algolia typings). The newLazyChatbotScripttype issue found during local validation was fixed before this PR.