docs(changelog): add the #1710 fragment

Co-Authored-By: Claude Fable 5.2 <[email protected]>

changelog.d/1710-cctv-still-render-hold.md

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+- A still-image CCTV camera no longer keeps the scene rendering 60 times a
+  second. Only a video feed holds continuous rendering; a still redraws when a
+  new image arrives (mazy1998, #1710).