Notifications: the face opens the sender's profile; faces of people you know stay cached; primal-hosted faces get thumbnails again

- A notification's avatar now opens the actor's profile (the name and the
  rest of the row still open the note).
- The profile cache held 150 rows evicted by fetch time, and a phone's feed
  churned all of them within twenty minutes, so a reload painted a punk and
  an npub for people you hear from daily. 300 rows now, and follows, DM
  peers and notification actors are evicted last (their thumbnails too).
- corsFetch's "is the host reachable?" probe was answered from the HTTP
  cache, so any network blip blamed the host: a phone had ~100 hosts
  written off as no-CORS, primal, nostr.build and coinos.io among them, and
  those faces painted from multi-MB originals on every repaint. The probe
  now goes past the cache and the polluted list is reset (v5).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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