Add flutter API linked snippets

[Pante]

Describe the changes

Checklist

• I have read the CONTRIBUTING.md.
• I have included the relevant unit/golden tests.
• I have included the relevant samples.
• I have updated the documentation accordingly.
• I have added the required flutters_hook for widget controllers.
• I have updated the CHANGELOG.md if necessary.

[Copilot]

Pull request overview

This pull request adds support for generating API documentation links to Flutter framework types in the documentation snippet generator. The changes enable the snippet generator to create proper links to api.flutter.dev for Flutter and dart:ui types, rather than treating them like regular pub.dev packages.

Changes:

• Added Flutter package to the tracked packages list with special handling
• Modified documentation URL generation to use api.flutter.dev for Flutter and dart:ui types
• Updated tooltip generation to exclude Flutter types (since Flutter has its own comprehensive documentation)

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
docs_snippets/tool/snippet_generator/main.dart	Adds the Flutter package (using material.dart as the library entry point) to the list of tracked packages with an empty version string
docs_snippets/tool/snippet_generator/dart_doc_linker.dart	Adds special URL generation for dart:ui types and Flutter package types to link to api.flutter.dev instead of pub.dev, and refactors the base URL construction logic
docs_snippets/tool/snippet_generator/tooltip_linker.dart	Modifies the _forui method to explicitly exclude Flutter types from tooltip generation

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[Copilot]

Accessing barrel.uri.pathSegments.last could throw a StateError if the path segments list is empty. Consider adding a check to ensure the list is not empty before accessing .last, or handle the potential exception. For example, you could check if barrel.uri.pathSegments.isNotEmpty before accessing .last.

Suggested change

	if (package == 'flutter') {
	base = 'https://api.flutter.dev/flutter/${p.basenameWithoutExtension(barrel.uri.pathSegments.last)}';
	final segments = barrel.uri.pathSegments;
	if (package == 'flutter') {
	if (segments.isEmpty) {
	// Avoid StateError from accessing segments.last on an empty list.
	continue;
	}
	base = 'https://api.flutter.dev/flutter/${p.basenameWithoutExtension(segments.last)}';

[auto-maid]

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