Adds a small toolbar next to the comment-count badge with four actions:
- Share — uses `navigator.share()` on supporting devices, falls back
to copy-link otherwise
- Copy link — clipboard API with `<input>` + `execCommand` fallback,
flashes a checkmark for 1.5s on success
- Print — `window.print()`, hidden via `print:hidden` so it doesn't
show up in the printed output itself
- Reading time — server-computed from headline+body HTML at ~200 wpm,
hidden when 0
Reading time + canonical URL come from `+page.server.ts` so SSR
output is identical and shareable URLs render correctly.
All labels go through the translations layer (5 new
`post_action_*` keys).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Peter Meier