fix: improve router

[schultek]

Description

Fixes #190 Fixes #182

Type of Change

Ready Checklist

• [ ] I've read the Contribution Guide.
• [ ] In case this PR changes one of the core packages, I've modified the respective CHANGELOG.md file using the semantic_changelog format.
• [ ] I updated/added relevant documentation (doc comments with ///).
• [ ] I added myself to the AUTHORS file (optional, if you want to).

[github-actions[bot]]

Package Version Report

The following packages have been updated: jaspr : 0.10.0 -> 0.11.0 jaspr_builder : 0.10.0 -> 0.11.0 jaspr_cli : 0.10.0 -> 0.11.0 jaspr_flutter_embed : 0.2.0 -> 0.3.0 jaspr_riverpod : 0.3.9 -> 0.3.10 jaspr_router : 0.3.1 -> 0.4.0 jaspr_test : 0.10.0 -> 0.11.0

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 60.27397% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 60.54%. Comparing base (f8f64d5) to head (0721c95).

Files	Patch %	Lines
packages/jaspr_router/lib/src/link.dart	0.00%	19 Missing :warning:
packages/jaspr_router/lib/src/router.dart	72.00%	7 Missing :warning:
...ges/jaspr_cli/lib/src/commands/create_command.dart	75.00%	2 Missing :warning:
packages/jaspr/lib/src/components/style.dart	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #192 +/- ## ========================================== + Coverage 59.87% 60.54% +0.67% ========================================== Files 101 118 +17 Lines 4212 5110 +898 ========================================== + Hits 2522 3094 +572 - Misses 1690 2016 +326 ```

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