Plotly.react resets any scene attribute the incoming layout omits, so every
selection change snapped the camera back to the default and re-fit the
ranges - the pinned framing was meaningless. Data-only pushes now pass
preserveView and html.py merges the live camera and axis ranges into the
incoming layout; only an explicit re-frame sends computed framing.
Also fixes the ordering bug where the framing flag was consumed before the
not-ready early return, which dropped the very first framing on the floor
(show_project runs before loadFinished).
Verified in the browser: user orbit + zoom survive selection and working
plane updates, while reset_camera re-frames. Regression-tested headlessly
by asserting the emitted preserveView flag.
smillmorel
8f7bc3cf4f