feat: Add FindByText in bunit.web.query

[scottsauber]

Pull request description

PR meta checklist

• Pull request is targeted at main branch for code
  or targeted at stable branch for documentation that is live on bunit.dev.
• Pull request is linked to all related issues, if any.
• I have read the CONTRIBUTING.md document.

Code PR specific checklist

• My code follows the code style of this project and AspNetCore coding guidelines.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• I have updated the appropriate sub section in the CHANGELOG.md.
• I have added, updated or removed tests to according to my changes.
  • All tests passed.

[scottsauber]

@egil @linkdotnet - start of this, not quite ready for review yet but just FYI.

[Copilot]

Pull request overview

Adds text-based query APIs to bunit.web.query, enabling components to be searched by normalized text content (with options for selector scoping and string comparison), along with associated exceptions and test coverage.

Changes:

• Introduces FindByText / FindAllByText extension methods with whitespace normalization, selector filtering, and comparison options.
• Adds ByTextOptions and TextNotFoundException to support the new query API.
• Adds a comprehensive TextQueryExtensionsTest suite covering core matching behavior and options.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/bunit.web.query.tests/Text/TextQueryExtensionsTest.cs	Adds unit tests validating text-query matching behavior and options.
src/bunit.web.query/Text/TextQueryExtensions.cs	Implements FindByText / FindAllByText with whitespace normalization and selector/comparison options.
src/bunit.web.query/Text/TextNotFoundException.cs	Adds exception thrown when FindByText cannot locate a matching element.
src/bunit.web.query/Text/ByTextOptions.cs	Adds options record for selector scoping and StringComparison behavior.
src/bunit.web.query/ByTextElementFactory.cs	Adds element wrapper factory so returned elements remain valid across re-renders.

[Copilot]

This test claims to verify that the first matching element is returned, but it only asserts that a non-null element is returned. To make the test meaningful and stable, constrain the selector (e.g., to the two spans) and assert which element is returned (e.g., by checking the id).

Suggested change

	var element = cut.FindByText("Hello World");
	element.ShouldNotBeNull();
	// The first matching element could be a parent or the first span
	// depending on DOM structure - just verify we get a result
	var element = cut.FindByText("Hello World", o => o.Selector = "span");
	element.ShouldNotBeNull();
	element.Id.ShouldBe("first");

[Copilot]

The comment says this test uses the "*" selector, but the test actually sets Selector = "span". Either update the comment or change the selector so the comment matches what’s being exercised.

Suggested change

	var elements = cut.FindAllByText("Hello", o => o.Selector = "span");
	var elements = cut.FindAllByText("Hello", o => o.Selector = "*");