Point Chat decision prompts to the card and keep reopening copy truthful

Chat's prompt was a second Save surface beside the card, ignored open
objections and was labelled "Open in plan". It is now one quiet line,
"Ready to settle: <option> · 1 objection · Open card", and its retired
states keep the same Open card link. The card's "from chat" sub-label is
now an inline "Suggested in Chat" hint.

A reopening message only proposes a pending candidate; a card-linked
thread reopens from the card. The result line now says "Suggested
reopening <title>" for a pending candidate and keeps "Reopened" for a
confirmed one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>