Refactor: rename contact samples to custom-components-example

[dmandar]

Description

Renamed the agent and the client to something clearer. Will have a separate MCP apps only sample.

Pre-launch Checklist

• [ X] I signed the CLA.
• [ X] I read the Contributors Guide.
• [ X] I read the Style Guide.
• [ X] I have added updates to the CHANGELOG.
• [ X] I updated/added relevant documentation.
• [ X] My code changes (if any) have tests.

If you need help, consider asking for advice on the discussion board.

[gemini-code-assist]

Code Review

This pull request renames the "contact" and "contact_multiple_surfaces" sample to "custom-components-example" across the agent and client codebases, updating documentation, workspace configurations, and test paths. The review feedback identifies several remaining inconsistencies where the old naming or descriptions are still present, specifically within the test catalog configurations, the Python package name in the lock file (which requires a change in pyproject.toml), and the npm package description.

[gemini-code-assist]

For consistency with the renaming of the sample from contact_multiple_surfaces to custom-components-example, the name of this CatalogConfig should also be updated. This will improve clarity and maintainability of the tests.

Suggested change

	name="contact_multiple_surfaces_inline_catalog",
	name="custom-components-example_inline_catalog",

[gemini-code-assist]

The package name here is inconsistent with the directory rename to custom-components-example. The package name should be updated to a2ui-custom-components-example in the corresponding pyproject.toml file to maintain consistency across the project. After updating pyproject.toml, this lock file should be regenerated.

name = "a2ui-custom-components-example"

[gemini-code-assist]

The package description still refers to 'Contact Demo'. To align with the renaming of the package to custom-components-example, it would be clearer to update the description as well.

Suggested change

	"description": "A2UI Contact Demo",
	"description": "A2UI Custom Components Example Demo",