fix: preserve parentheses around "or" in @media with type

[veeceey]

The CSS minifier was dropping necessary grouping parentheses around "or" expressions when they appeared after a media type with "and". For example:

/* Input */
@media screen and ((min-width: 10px) or (min-height: 10px)) { color: blue; }

/* Before (invalid CSS - "and" and "or" mixed at same level) */
@media screen and (min-width:10px)or (min-height:10px){color:blue}

/* After (valid) */
@media screen and ((min-width:10px)or (min-height:10px)){color:blue}

Per the CSS spec, <media-condition-without-or> only allows <media-in-parens> [and <media-in-parens>]*, so an "or" group must be wrapped in parentheses. The printer was passing flags=0 when printing the condition from MQType, so MQBinary{Op: Or} didn't get its outer parens. The fix passes mqNeedsParens when the condition is an "or" binary.

Verified that regular "and" chains after media types still produce minimal output without extra wrapping.

Tests pass:

go test ./... 
ok  github.com/evanw/esbuild/internal/css_parser    0.458s
ok  github.com/evanw/esbuild/pkg/api                2.718s
(all packages pass)

Fixes #4395

[veeceey]

Test Results

All tests pass:

$ go test ./...
ok  github.com/evanw/esbuild/internal/css_lexer     0.487s
ok  github.com/evanw/esbuild/internal/css_parser     0.458s
ok  github.com/evanw/esbuild/internal/css_printer    0.933s
ok  github.com/evanw/esbuild/pkg/api                 2.718s

Manual verification:

/* Input */
@media screen and ((min-width: 10px) or (min-height: 10px)) { .test { color: blue } }

/* --minify output (before fix) */
@media screen and (min-width:10px)or (min-height:10px){.test{color:#00f}}

/* --minify output (after fix) */
@media screen and ((min-width:10px)or (min-height:10px)){.test{color:#00f}}

Also verified no regression for regular "and" chains:

/* Input */
@media screen and (min-width: 10px) and (min-height: 10px) { .test { color: blue } }
/* --minify (no extra parens) */
@media screen and (min-width:10px)and (min-height:10px){.test{color:#00f}}