v3.1.0

@my-tien

Add property zerolinelayer to cartesian axes to allow drawing zeroline above traces [#7269]
Add pattern.path attribute as an alternative to the preset pattern.shape values, so you can use any SVG path string as a pattern fill. [#7280]
Allow configuration of horizontal legend max height [#7359]
Add modebardisable attribute to cartesian axes, to allow fine control over which buttons affect which axes [#7358]
Add support for ticklabelposition "inside"/"outside" for category axes with tickson set to "boundaries" [#7420],
with thanks to @my-tien for the contribution!
Add unifiedhovertitle.text to format unified hover titles [#7439]
Add layout.hoverlabel.showarrow (and trace.hoverlabel.showarrow) attribute to allow hiding the triangular caret that appears on the hover label box [#7451]
Add minorloglabels to cartesian axes [#7468]
Make modebar keyboard-accessible via tabbing [#7492], with thanks to @davidangarita1 for the contribution!

Switch to United Nations (coastlines, countries, land, ocean) + Natural Earth (lakes, rivers, subunits) geodata for building topojson used in geo plot [#7393]
Make 'png' all caps [#7400]
Refactor files related to UN topojson [#7481]
Update default topojsonURL to point to new UN topojson [#7514]
Add breaking change warning for country names locationmode option in choropleth, scattergeo plots [#7514]

Fix performance warning in scattergl traces, [#7390], with thanks to @MzyzzG for the contribution!
Move css-loader and other dependencies into devDependencies section [#7407]
Fix hidden ticklabels taking up plot space [#7417]
Fix editable shapes (regression introduced in 2.34.0) [#7470], with thanks to @my-tien for the contribution!
Update legend maxheight calculation logic [#7483]
Fix hover event not triggered on consecutive empty bins (count=0) with hovermode:'x' for histogram [#7503], with thanks to @Lexachoc for the contribution!
Remove form-data nested dependency associated with CVE-2025-7783 [#7514], with thanks to @KyleBoyer for the contribution!

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