fix: Resolve all test failures and improve error handling

[jona42-ui]

• Added is reusable=True to HTTP mock callbacks
• Fixed IDNotFound exception to use proper error handler instead of abort()

Fixes #24

[Copilot]

Pull request overview

This PR aims to resolve current CI test failures and make error handling consistent with the app’s AppException JSON error responses (Fixes #24).

Changes:

• Made pytest_httpx callbacks reusable in SPARQL mock fixtures to avoid callback exhaustion across multiple requests.
• Replaced abort(404) with raising IDNotFound so Flask’s AppException handler returns application/problem+json.
• Updated the test TDD description fixture to include response.contentType fields and reformatted JSON.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tdd/tests/data/tdd-description.json	Reformats test fixture and adds missing response.contentType entries.
tdd/tests/conftest.py	Updates httpx_mock.add_callback usage to be reusable across requests.
tdd/lib/init.py	Adds package marker so tdd.lib works with importlib.resources.
tdd/errors.py	Expands IDNotFound to provide a clearer title and localized messages.
tdd/common.py	Switches 404 handling from abort() to raising IDNotFound.
.gitignore	Ignores local venv and generated JS artifacts under tdd/lib.

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[Copilot]

This file is only used to make tdd.lib a Python package for importlib.resources; the current comment # JavaScript library module is potentially misleading given it’s a Python package. Consider replacing it with a short module docstring clarifying it exists to package/access built JS assets.

Suggested change

	# JavaScript library module
	"""Package providing access to built JavaScript assets via importlib.resources."""

[wiresio]

Thanks @jona42-ui!