Add Slide Layout Tool

[bollwyvl]

References

• fixes Enable basic drag-and-drop organization of cells on slides #27

Changes

• adds design tools in bottom right
  • toggle layout overlay
  • slide type
  • layer type
• adds slide layout overlay
  • drag for move
  • handles for resize
  • z-index?
  • zoom?
  • opacity?
• tests

[codecov]

Codecov Report

Merging #28 (8cc03b9) into main (effae0b) will increase coverage by 1.58%.
The diff coverage is 89.33%.

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   89.02%   90.60%   +1.58%     
==========================================
  Files          11       13       +2     
  Lines         756     1139     +383     
  Branches      146      229      +83     
==========================================
+ Hits          673     1032     +359     
- Misses         57       66       +9     
- Partials       26       41      +15     

Flag	Coverage Δ
back-end	100.00% <ø> (ø)
front-end	90.45% <89.33%> (+1.70%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
js/jupyterlab-deck/src/notebook/presenter.ts	88.99% <76.82%> (+2.60%)	⬆️
js/jupyterlab-deck/src/manager.ts	85.60% <80.72%> (-2.16%)	⬇️
js/jupyterlab-deck/src/notebook/metadata.tsx	92.22% <92.30%> (ø)
js/jupyterlab-deck/src/tools/design.tsx	93.54% <93.54%> (ø)
js/jupyterlab-deck/src/tools/layover.ts	95.34% <95.34%> (ø)
js/jupyterlab-deck/src/icons.ts	100.00% <100.00%> (ø)
js/jupyterlab-deck/src/plugin.ts	100.00% <100.00%> (ø)
js/jupyterlab-deck/src/tokens.ts	100.00% <100.00%> (ø)
js/jupyterlab-deck/src/tools/remote.tsx	82.85% <100.00%> (ø)
... and 1 more

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