fix(theme): set color-scheme css property in theme context

[danilowoz]

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It infers the main surface color from the theme and sets the properly color-scheme: dark | light in order to make sure the scrollbars have the suitable theme too.

Closes #489

[codesandbox-ci]

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Sandpack Blog Example 1	Configuration

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Size changes

sandpack-react

Total base (gzip)	Total current (gzip)	+/-
161 kb	161 kb	⚠️ +41 bytes (+0.02%)

Details

Dependency name / file	Base	Current	+/-
0	522 kb	522 kb	✅ 0 byte
main	480 kb	480 kb	⚠️ +121 bytes (+0.02%)
@codesandbox/sandpack-react	82 kb	83 kb	⚠️ +160 bytes (+0.19%)
@code-hike/classer	1 kb	1 kb	✅ 0 byte
@codesandbox/sandpack-client	11 kb	11 kb	✅ 0 byte
@stitches/core	16 kb	16 kb	✅ 0 byte
@codemirror/state	35 kb	35 kb	✅ 0 byte
@codemirror/view	167 kb	167 kb	✅ 0 byte
@codemirror/closebrackets	6 kb	6 kb	✅ 0 byte
@codemirror/matchbrackets	4 kb	4 kb	✅ 0 byte
@codemirror/commands	24 kb	24 kb	✅ 0 byte
@codemirror/comment	5 kb	5 kb	✅ 0 byte
@codemirror/gutter	10 kb	10 kb	✅ 0 byte
@codemirror/highlight	12 kb	12 kb	✅ 0 byte
@codemirror/history	9 kb	9 kb	✅ 0 byte
@react-hook/intersection-observer	2 kb	2 kb	✅ 0 byte
@codemirror/lang-css	11 kb	11 kb	✅ 0 byte
@codemirror/lang-javascript	6 kb	6 kb	✅ 0 byte
@codemirror/lang-html	15 kb	15 kb	✅ 0 byte
@codemirror/text	13 kb	13 kb	✅ 0 byte
style-mod	3 kb	3 kb	✅ 0 byte
@codemirror/rangeset	16 kb	16 kb	✅ 0 byte
w3c-keyname	2 kb	2 kb	✅ 0 byte
@lezer/common	34 kb	34 kb	✅ 0 byte
@codemirror/language	19 kb	19 kb	✅ 0 byte
@react-hook/passive-layout-effect	191 bytes	191 bytes	✅ 0 byte
@lezer/css	9 kb	9 kb	✅ 0 byte
@lezer/html	12 kb	12 kb	✅ 0 byte
@lezer/javascript	54 kb	54 kb	✅ 0 byte
@codemirror/autocomplete	34 kb	34 kb	✅ 0 byte
@lezer/lr	31 kb	31 kb	✅ 0 byte
@codemirror/tooltip	14 kb	14 kb	✅ 0 byte
lodash.isequal	18 kb	18 kb	✅ 0 byte
lz-string	9 kb	9 kb	✅ 0 byte
react-devtools-inline	823 kb	823 kb	✅ 0 byte
codesandbox-import-utils	3 kb	3 kb	✅ 0 byte
package-build-stats	487 bytes	487 bytes	✅ 0 byte
intersection-observer	13 kb	13 kb	✅ 0 byte
react-is	2 kb	2 kb	✅ 0 byte

sandpack-client

Total base (gzip)	Total current (gzip)	+/-
7 kb	7 kb	✅ 0 byte

Details

Dependency name / file	Base	Current	+/-
main	20 kb	20 kb	✅ 0 byte
@codesandbox/sandpack-client	11 kb	11 kb	✅ 0 byte
codesandbox-import-utils	3 kb	3 kb	✅ 0 byte
lodash.isequal	18 kb	18 kb	✅ 0 byte
package-build-stats	487 bytes	487 bytes	✅ 0 byte