Types for viewer modifications

[allanlasser]

• All existing tests pass
• Svue removed from src/viewer/modification/modification

⚠️ Not ready to merge. I need to handle reactivity in the class. Currently, selecting thumbnails to modify does not display the modification controls. It could be that I went too far in this PR and need to rollback the de-Svue of modifications.

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[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🔴	Statements	2.79% (-0.01% 🔻)	1973/70737
🔴	Branches	2.87% (-0.17% 🔻)	873/30386
🔴	Functions	3.17% (-0.04% 🔻)	497/15678
🔴	Lines	2.84% (-0% 🔻)	1795/63226

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / modifySpec.ts	82.06%	77.57%	76.83%	85.17%
🟢	... / modification.ts	76.79%	61.76%	80.56%	81.73%

Test suite run success

84 tests passing in 16 suites.

Report generated by 🧪jest coverage report action from 75ed158