Extend the reload-safe meta+link pattern (introduced for "Subscribed") to
more inbox entries, so every notice that can point somewhere does:
- A "Marked watched" activity notice now offers "Find in feed" (jumping to
the feed filtered to Watched + that channel), alongside Unwatch — matching
what the "Hidden" notice already does. VideoWatchedMeta carries the
channel, and locate() handles both hidden and watched.
- A scheduler job-completion notice (System) now offers "Open Scheduler",
jumping to the dashboard.
Maintenance notices reference already-removed videos, so they stay
informational with nothing to navigate to.
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