Add posts by actor to people page

Select posts by the actor from the given timeline range.

Since posts by the actor may be very sparse in the timeline, add a
"More (x 10)" button to bump the show count, that controls how many
timeline posts we'll filter *from*.

We could conceivably keep searching the timeline until we find as many
posts as requested or reach the end, but that could take a very long
time.  Just filtering the given ranges is much simpler, and probably
sufficiently intuitive despite the potential initial surprise.

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