Summary

Removes the APIs that are related to chart studio with the exception of a couple (Plots.sendDataToCloud, plotlyServerURL, the sendDataToCloud modebar button, and the plotly_beforeexport/plotly_afterexport events) in anticipation of adding similar behavior for Plotly Cloud soon.

Removed

Legacy on-graph "Edit chart" link

• Config options: showLink, linkText, sendData, showSources
• Plots.addLinks and its positionPlayWithData helper (and the call site in the plot sequence)
• The showLink = false static-plot override and the showLink passthrough in Snapshot.clone

Legacy streaming

• The stream trace attribute (stream.token / stream.maxpoints) — vestigial; plotly.js has no streaming client. This was attached to every trace type, hence the bulk of the schema diff.
• The now-unreachable keepstream branch in Plots.graphJson

"Edit in Chart Studio" pencil button

• The editInChartStudio modebar button and its showEditInChartStudio config option
• Simplified manage.js so the cloud button group is driven solely by showSendToCloud

Kept (reusable upload pipeline)

Intentionally left intact for the upcoming Plotly Cloud project:

• Plots.sendDataToCloud
• plotlyServerURL config
• The sendDataToCloud (floppy-disk) modebar button + showSendToCloud config
• The plotly_beforeexport / plotly_afterexport events

General-purpose export APIs (Plotly.toImage, Plotly.downloadImage, Plotly.Snapshot.*, PlotSchema.get, graphJson) are unaffected.

Testing

• Updated affected jasmine tests (config_test, modebar_test, snapshot_test)
• Lint clean; modebar suite passes (103/103). Remaining failures in the local run are pre-existing WebGL/retina environment issues unrelated to this change.