DRAFT: fix/prefetch overlay

[interim17]

DRAFT: waiting on some final color feedback from UX, but this the basic feature

Problem

Closes #136 and #137

Solution

Conditionally render overlay, spinner and text based on state of the app.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	20.19%	367 / 1817
🔵	Statements	20.19%	367 / 1817
🔵	Functions	40%	24 / 60
🔵	Branches	71.05%	81 / 114

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
src/components/Viewer/index.tsx	0%	0%	0%	0%	1-4, 6-11, 13-20, 22-23, 25-37, 39, 41, 43
src/state/store.ts	0%	0%	0%	0%	1, 44, 46-52, 54-56, 58, 60-63, 65-76, 78-79, 81-82, 84-86, 89-90, 93, 96-100, 102-104, 106-108, 110-113, 115-123, 125-136, 138-149, 151-153, 155, 157-162, 164-173, 176-179, 182-188, 191-194, 196-197, 199-205, 207-220, 222-236, 238-239, 243-249, 251-254, 256-261, 263-267, 269-273, 275, 277-278, 282-284, 286-289, 291-294, 296-299, 301-304, 306-317, 319-322, 325-340
src/style/themeRoot.tsx	0%	0%	0%	0%	1, 5-9, 11-17, 19-24, 26

Generated in workflow #149

[github-actions]

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[meganrm]

@interim17 what's the status with this? I know you said you needed some feedback from @thao-do

[interim17]

@interim17 what's the status with this? I know you said you needed some feedback from @thao-do

I think we are good to go? But I made a new PR because this branch got stale:
#162