feature: PR 6/8 — React ItemDetails, recursive Comment and poll rendering

[devin-ai-integration]

Summary

PR 6 of the Angular→React migration: the item page. The PR 4 ItemDetails placeholder becomes a real port of item-details.component.* (still lazy-loaded), plus a recursive Comment port. Nothing under src/app/ changes.

Points worth knowing:

• Story gained content? and text?. The Angular template reads item.content (the post body) and item.text (drives the head-margin class) but the Angular Story class declares neither, so strict TS rejected both reads. Both are added as optional to the React model only; verified against a live ask item, the API sends content and not text, so head-margin never applies in practice — same as in Angular.
• Poll bar width is guarded. Angular computed points / poll_votes_count * 100 + '%' unguarded, which yields NaN% when the total is 0/undefined; React falls back to 0%.
• Collapse keeps the subtree mounted. Comment binds the real hidden attribute rather than conditionally rendering, matching Angular's [hidden]="collapse" — collapsing a deep thread and re-expanding it preserves each child's own collapse state.
• dangerouslySetInnerHTML is used for the post body and comment/poll content. This is parity with Angular's [innerHTML] on API-supplied pre-rendered HTML, not a new sink.
• Accessibility fix: the back button and the [-]/[+] collapse toggle were mouse-only span (click) handlers in Angular; they now carry role="button", tabIndex={0} and Enter/Space handling. Location.back() → useNavigate()(-1).
• Comment.scss needed the only non-mechanical SCSS change in the migration so far: Angular's :host >>> block became a .comment scoped block, with the component root carrying className="comment".
• Follow-up to PR 5: internal title links now keep their title class (the NavLink className callback was dropping it when inactive).

Verification

npm run typecheck:react and npx vite build pass, with the ItemDetails lazy chunk (JS + CSS) still emitted. Console clean.

Deep comment tree:

Collapsed comment (subtree hidden but still mounted):

Live poll 126809 — bars proportional to 73/49/179 points (24.25% / 16.28% / 59.47%):

Devin-Org: engineering

Link to Devin session: https://app.devin.ai/sessions/e6419ebe67ff4f749fe1573a8e26cd07
Requested by: @abboudp

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