feat(share): copy-link on discovery feeds and best-of archive (PR 16)

[tsahimatsliah]

Part of the sharing-visibility initiative (builds on PR 1 / #6343, based on claude/website-sharing-visibility-be6b32).

What

Adds the copy-link/share affordance to the discovery surfaces (plan item #25):

• Explore feed headers
  • FeedExploreHeader (non-v2; laptop breadcrumb header and mobile sticky tab bar): a ShareActions icon control joins the existing right-side period-dropdown span (Float/Large to match the dropdown). The span only becomes a flex ... gap-2 cluster when the flag is on, so flag-off DOM is unchanged.
  • MainFeedLayout v2 explore strip: the control renders between ExploreSectionTabs and ExploreSortDropdown, spaced by the page header's own gap-2, and only when isAnyExplore — the strip's /discussed instance does not get it (it is the Discussions feed, not an Explore sort; keeps v2/non-v2 surface parity).
  • Both call sites share the new ExploreFeedShareButton, which resolves the canonical webapp URL of the active sort (URL-derived on webapp, tab-state fallback for the extension) so links copied from the extension resolve. Distinct accessible name "Copy link to feed" (feed cards already own per-post "Copy link" buttons).
• Best-of archive (shared components, rendered by all nine webapp best-of routes: /posts/best-of*, /tags/[tag]/best-of*, /sources/[source]/best-of*)
  • ArchiveIndexPage and ArchiveFeedPage: control next to the h1, sharing the canonical archive URL (getArchiveIndexUrl / getArchiveUrl). Flag-off renders the exact original heading markup.

Logging

One event per entity, per the initiative convention: generic LogEvent.ShareLog with target_id = the page path and extra.origin = new Origin.ExploreFeed / Origin.BestOfArchive (appended at the end of the enum), extra.provider = share provider. No post-shaped events minted.

Flag

share_discovery, default false, appended at the end of featureManagement.ts. Gated via the new useShareDiscovery hook: useSharingVisibility() (master kill-switch) AND the per-topic flag through useConditionalFeature, with the per-topic flag only evaluated once the master gate passes. Flag-off is DOM-identical to the base branch (asserted in Jest via exact class-list checks).

Surfaces that did NOT get the control (and why)

• /discussed (v2 explore strip instance): Discussions feed, not a discovery sort — kept parity with non-v2 where the header doesn't render there.
• Explore hub directory pages (/tags, /sources, /users via ExploreHubHeader): out of this PR's scope (refactor: add guide to reputation #25 covers the discovery feeds + best-of archive only).
• Non-explore feed pages (/, /my-feed, /popular, custom feeds…): guarded by a webapp Jest test that forces the gate on and asserts the control never composes there.

Verification

• node ./scripts/typecheck-strict-changed.js — pass
• pnpm --filter shared lint / pnpm --filter webapp lint — pass
• NODE_ENV=test pnpm --filter shared test — 297 suites / 1995 tests passed
• NODE_ENV=test pnpm --filter webapp test — 45 suites / 298 tests passed
• New tests: copy → clipboard + toast; mobile → navigator.share; AND-gating (each flag alone = off); exactly one control; flag-off class-list parity; non-explore composition guard.

Notes

• The prompt's packages/webapp/components/archive/* paths don't exist — the archive pages live in packages/shared/src/components/archive/ (verified real paths).
• No Storybook story: the repo's Storybook only aliases @growthbook/growthbook (not -react), so a genuine flag-gated story can't be expressed; Jest is the flag guarantee per the initiative convention. The ShareActions primitive already has stories from PR 1.
• No referral cid on these links (no matching ReferralCampaignKey for feed/archive pages); plain canonical URLs.

🤖 Generated with Claude Code

Preview domain

https://claude-share-discovery.preview.app.daily.dev

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