feat(share): copy link on reading history rows behind share_history

[tsahimatsliah]

Part of the sharing visibility initiative (PR 18 — reading history, #14). Stacked on PR 1 (#6343) — base is claude/website-sharing-visibility-be6b32, not main.

Changes

• PostItemCard: new opt-in showCopyLink prop (default false) renders a visible "Copy link" icon action in the row's button cluster, right after the upvote/downvote pair. Single tap opens the native share sheet on mobile (navigator.share) and copies + toasts elsewhere, via the existing useShareOrCopyLink hook. Same ButtonSize.Small tertiary button as the vote actions, so row height and title truncation (line-clamp-2) are untouched. The click handler stopPropagations so the row's "Go to post" link never fires.
• ReadingHistoryList (the history page's only list): evaluates the gate — useSharingVisibility() master switch, then share_history via useConditionalFeature with shouldEvaluate chained off the master — and passes showCopyLink down. Flag logic stays out of the shared primitive (props-only, per repo convention).
• Logging: history rows are real posts, so this uses the normalized LogEvent.SharePost via postLogEvent(LogEvent.SharePost, post, { extra: { provider, origin } }) with the existing Origin.History — already what this list passes as logOrigin. No new event or origin minted.
• Link: post.commentsPermalink, verified on the typed ReadHistoryPost model (graphql/posts.ts — in the Pick list and selected by READING_HISTORY_QUERY).
• Storybook: Components/History/PostItemCard with HistoryRow (control absent) and HistoryRowWithCopyLink stories. The story drives the prop directly because the storybook GrowthBook mock forces boolean flags on; Jest carries the flag-off guarantee.
• Drive-by strict fixes surfaced by the changed-file guard in ReadingHistoryList (typed reduce accumulator; new Date(undefined) strict violation with runtime behavior preserved).

Flag

share_history, default false, appended at the end of featureManagement.ts. Gated on both the sharing_visibility master switch and share_history; the per-surface flag is only evaluated once the master is on. Flag-off renders the exact PR 1 DOM (prop defaults to false, no new wrappers).

Menu vs. row decision

Visible row control, no menu entry:

• The history row's actions are always visible (the vote buttons render flex on every viewport with showVoteActions), not hover-revealed — so a visible copy control placed with them serves touch directly. A menu fallback would render a second copy affordance on the same row by default, which was deliberately avoided.
• The row's ReadingHistoryOptionsMenu already offers "Share post via..." (full share sheet) as the deeper path; a "Copy link" menu entry would make it a third share affordance per row.
• On mobile the visible control taps straight into the native share sheet, matching the ShareActions primitive's mobile behavior from PR 1.

PostItemCard consumer audit

Consumer	Usage	Effect
shared/components/history/ReadingHistoryList.tsx → webapp components/history/reading.tsx (/history page; only consumer of the list)	showVoteActions, logOrigin={Origin.History}	Gets the control when flags are on
shared/components/post/infinite/InfiniteReadingHistory.tsx → ReadingHistoryModal (post picker)	showButtons={false} clickable={false}	Unchanged — showCopyLink defaults off and the control is additionally behind showButtons
shared/components/history/ReadingHistory.spec.tsx	tests	Extended; all original assertions untouched

No webapp/extension file renders PostItemCard directly.

Verification

• node ./scripts/typecheck-strict-changed.js — pass
• pnpm --filter shared lint — pass (webapp source untouched)
• NODE_ENV=test pnpm --filter shared test — pass
• NODE_ENV=test pnpm --filter webapp test — pass
• New tests: copy → clipboard receives commentsPermalink + toast + SharePost log with { provider, origin: 'history' }; mobile → navigator.share (clipboard untouched); flag-off / master-off / not-opted-in → no copy control, original DOM; one control per row when on; existing vote/hide/menu tests untouched and green.

🤖 Generated with Claude Code

Preview domain

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

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Project	Deployment	Actions	Updated (UTC)
daily-webapp	Ready	Preview	Jul 22, 2026 8:38pm
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