fix(mantine): make EllipsisText style more adaptable

[gdostie]

Proposed Changes

When using the EllipsisText component inside other components like buttons or nav links, I realized that its style was sometimes creating unwanted overrides.

This PR makes the component more adaptable to its parent style:

• Changing the Text node to be a span instead of a p
• Adding inherit prop on the text node, so that it can take its parent text styles
• Ensuring width and display can easily be overridden via the styles API

Potential Breaking Changes

None, the component should look exactly as it did before

Acceptance Criteria

• The proposed changes are covered by unit tests
• The potential breaking changes are clearly identified
• README.md is adjusted to reflect the proposed changes (if relevant)

[github-actions]

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