breaking: parse media feature names and values into structured nodes

[bartveneman]

Add granular media feature parsing to match CSSTree's approach:

• Add name property to MEDIA_FEATURE nodes (accessible via feature.name)
• Parse feature values into typed child nodes (DIMENSION, IDENTIFIER, etc.)
• Add FEATURE_RANGE node type (value 39) for range syntax support
• Support modern range syntax: (50px <= width <= 100px), (width >= 400px)

Implementation:

• Extract feature name and store in content fields
• Parse value portion into typed AST nodes as children
• Detect comparison operators (<=, >=, <, >, =) for range syntax
• Add helper methods: parse_feature_value(), parse_value_token(), parse_feature_range()

BREAKING CHANGE: The .value property on MEDIA_FEATURE nodes no longer
returns the full feature string (e.g., "min-width: 768px"). Use .name
to access the feature name and .children to access parsed values.

Before:

feature.value // "min-width: 768px"

After:
feature.name // "min-width"
feature.children[0].type // DIMENSION
feature.children[0].text // "768px"

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.56522% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.07%. Comparing base (27df82c) to head (5862450).

Files with missing lines	Patch %	Lines
src/parse-atrule-prelude.ts	94.44%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   95.10%   95.07%   -0.03%     
==========================================
  Files          15       15              
  Lines        2471     2559      +88     
  Branches      636      662      +26     
==========================================
+ Hits         2350     2433      +83     
- Misses        121      126       +5     

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[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 4.7kB (3.53%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
@projectwallace/css-parser-esm	137.91kB	4.7kB (3.53%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: @projectwallace/css-parser-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
parse-*.js	4.5kB	22.0kB	25.73% ⚠️
css-*.js	55 bytes	16.73kB	0.33%
arena.js	41 bytes	10.74kB	0.38%
string-*.js	43 bytes	3.32kB	1.31%
constants.js	47 bytes	2.01kB	2.4%
index.js	15 bytes	1.79kB	0.84%

Files in parse-*.js:

• ./src/parse-atrule-prelude.ts → Total Size: 21.24kB

Files in css-*.js:

• ./src/css-node.ts → Total Size: 15.89kB

Files in arena.js:

• ./src/arena.ts → Total Size: 9.84kB

Files in string-*.js:

• ./src/string-utils.ts → Total Size: 2.88kB

Files in constants.js:

• ./src/constants.ts → Total Size: 672 bytes