Batch: data viz improvements for Cycle 2024.3

[larsyencken]

A candidate list of improvements for us to consider and prioritise.

Mobile

Issues partly taken from #3070

Bugs

• Some countries in Asia don't show up on zoom on mobile #3011
• Tooltip overflows (example, example), see ✨ (grapher) fixed tooltip position on mobile / TAS-520 #3679
• Marimekko: Labels take up too much space (esp on smaller screens) #3683

Papercuts

• Hide single-entity legends when appropriate #2594
• "Show selection only" toggle almost overlaps with content switchers (example)
• On data pages, Grapher should bleed onto the edges horizontally, similar to how it's done on Grapher pages and in articles (example)
• Hide full-screen mode when it makes the viewing experience worse (see Mobile usability in full screen mode #2887)
• Improve touch interactions on mobile (see Mobile usability of graph legends #3136)
• LineChart/StackedArea: Improve labelling when space is tight #3351
• DualAxis: Multi-line y-axis labels push tick labels into the chart area #2793 (example)
• Legend: Align label and indicator at the top
• Long StackedDiscreteBar labels should wrap #2629

Mini projects

• Audit chart types for space savings on mobile
• 🎉 (grapher) add a globe view / TAS-516 #3589
• Improve tooltips on mobile, see ✨ (grapher) fixed tooltip position on mobile / TAS-520 #3679

Maps

• Admin: Add support for manually ordering legend items in maps #2710
• Add center value for diverging map brackets #2166
• Use type information to choose better colour palettes (e.g. for ordinal variables)

Chart switching

• Refactor isLineChartThatTurnedIntoDiscreteBar away
• Add "Bar" chart tab for line charts
• Add "Slope" chart tab for line charts

Mini projects

• Cycle 2024.2: Region DoDs #3333
• Support negative rounding and rounding by significant figures #1851
• Add group labels in SVG for easier manipulation in Figma #3607

Misc

• Don't animate a scatter plot as a time scatter #2855
• Add tolerance to stacked area charts #2861
• The "Restore" button in the chart admin does not work #3643