Attention follow-ups: deferred review findings from #2860 #2903

Follow-up to Attention follow-ups, which deferred these review findings (from Auto's review and Logan's inline notes). None blocked the merge.

• Watch rows still label a nameless watch from the slug. WatchRow.tsx:99 uses title(watch.interest_id), so a card titled "Release checks" with id rel-ci has rows and aria-labels that say "rel ci" ("Delete rel ci"). Share the card's rule (title, then heading, then slug) from Tab.tsx:252.
• Resuming a paused Interest drops a skipped watch's saved progress. When the Interest becomes readable again, store.ts:488 returns watch and discards interest_paused.{timer,history,completed}. An over-limit timer in a paused Interest loses used on resume, so a reader with a higher limit restarts its max_occurrences budget. (thread)
• Route buzz: and nostr:nprofile links in Interest instructions in-app. Only nostr:npub1… opens in the app; everything else goes to target="_blank", though interest_set asks agents to link messages and channels. Activity already routes buzz: links with buzzLinkTarget. Treat nprofile like npub, route buzz: the same way, and show other nostr: links as text. (thread)
• Keep title and summary when interest_set omits them. paused survives an instructions-only write, but an omitted title or summary is cleared (attention.ts:365), so an agent that only updates instructions silently turns its card back into the slug. Keep them when omitted; clear on an explicit "". (thread)
• Timers that fired before feat(attention): Interest titles, summaries and named people, and Activity and pause fixes #2860 still say "No activity yet". Their history has only lastWokeAt. Fall back to "Last fired " when it is set (Activity.tsx:328). (thread)
• Memoize Activity row text. plainText(entry.text) parses up to 4 KB of Markdown per row on every render. useMemo on entry.text covers it. (thread)