feat: add standalone css generation from @css declarations

[schultek]

Description

Supports a new standalone option for style generation. Makes @css also work in client mode.

Type of Change

• ✨ New feature or improvement

[docs-page]

To view this pull requests documentation preview, visit the following URL:

docs.page/schultek/jaspr~780

Documentation is deployed and generated using docs.page.

[github-actions]

Package Version Report

The following packages have been updated:
jaspr_test : 0.22.4 -> 0.23.0
jaspr : 0.22.4 -> 0.23.0
jaspr_builder : 0.22.4 -> 0.23.0
jaspr_cli : 0.22.4 -> 0.23.0
jaspr_lints : 0.6.1 -> 0.7.0
jaspr_router : 0.8.1 -> 0.8.2
jaspr_content : 0.5.1 -> 0.5.2
jaspr_flutter_embed : 0.4.10 -> 0.4.11
jaspr_riverpod : 0.4.4 -> 0.4.5
jaspr_serverpod : 0.6.0 -> 0.6.1

[codecov]

Codecov Report

❌ Patch coverage is 87.37864% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.56%. Comparing base (cdbc321) to head (c1ab71c).
⚠️ Report is 1 commits behind head on next.

Files with missing lines	Patch %	Lines
...lib/src/server/adapters/global_styles_adapter.dart	30.00%	7 Missing ⚠️
packages/jaspr_builder/lib/src/utils.dart	72.22%	5 Missing ⚠️
...uilder/lib/src/options/server_options_builder.dart	78.94%	4 Missing ⚠️
packages/jaspr_cli/lib/src/helpers/css_helper.dart	85.71%	4 Missing ⚠️
packages/jaspr_lints/lib/src/utils/scope_tree.dart	81.25%	3 Missing ⚠️
...lder/lib/src/styles/styles_standalone_builder.dart	92.00%	2 Missing ⚠️
..._builder/lib/src/styles/styles_bundle_builder.dart	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #780      +/-   ##
==========================================
+ Coverage   68.35%   68.56%   +0.21%     
==========================================
  Files         210      212       +2     
  Lines       11700    11828     +128     
==========================================
+ Hits         7997     8110     +113     
- Misses       3703     3718      +15     

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