fix(overlays): hide overlays before hydration

[TomMenga]

No description provided.

[kyubisation]

LGTM 👍

[codecov-commenter]

Codecov Report

Attention: 59 lines in your changes are missing coverage. Please review.

Comparison is base (638977d) 92.61% compared to head (448811a) 95.96%.
Report is 69 commits behind head on master.

Files	Patch %	Lines
...nents/core/common-behaviors/slot-child-observer.ts	93.33%	5 Missing ⚠️
src/components/core/dom/breakpoint.ts	42.85%	4 Missing ⚠️
src/components/card/card-action/card-action.ts	70.00%	3 Missing ⚠️
src/components/core/dom/dataset.ts	25.00%	3 Missing ⚠️
src/components/core/dom/host-context.ts	40.00%	3 Missing ⚠️
src/components/header/header/header.ts	50.00%	3 Missing ⚠️
src/components/tooltip/tooltip/tooltip.ts	25.00%	3 Missing ⚠️
src/components/calendar/calendar.ts	86.66%	2 Missing ⚠️
src/components/core/dom/find-referenced-element.ts	60.00%	2 Missing ⚠️
src/components/menu/menu/menu.ts	75.00%	2 Missing ⚠️
... and 25 more

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2226      +/-   ##
==========================================
+ Coverage   92.61%   95.96%   +3.35%     
==========================================
  Files          53      329     +276     
  Lines        2409    39096   +36687     
  Branches      254     2183    +1929     
==========================================
+ Hits         2231    37519   +35288     
- Misses        176     1531    +1355     
- Partials        2       46      +44     

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