hotspots: Animate more tastefully.
hotspots: Animate more tastefully.

Bounce five times, once every 5 seconds, rather than forever every
0.75 seconds.  This reduces annoying user distraction and idle CPU/GPU
consumption.

Fixes #13760.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulipchat.com>

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