Add heading component

[TomWoodward]

some downstream projects (found in assignments and staxpass at least) were using the as prop on the headings, the new Heading component replaces that pattern.

[Copilot]

Pull request overview

Adds a new Heading component to replace downstream usage of an as prop on existing heading components, allowing semantic heading level (h1–h6) to be independent from the applied visual style.

Changes:

• Introduces Heading with level/variant props and ref forwarding, and refactors H2/H3 to use it.
• Adds a Storybook story demonstrating semantic level vs visual style override.
• Bumps package version and removes the .lastsync file.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/components/Text.tsx	Adds Heading and refactors H2/H3 to build on it.
src/components/Text.stories.tsx	Demonstrates Heading usage, including style override.
package.json	Patch version bump for the new exported component.
.lastsync	Removes an unreferenced sync marker file.

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[RoyEJohnson]

The Copilot suggestion for a test is good, but the question of handling levels default variants with levels of other than 2 or 3 needs cleared up.

[TomWoodward]

i added the spec. i'm not gonna do anything on the variant types because there is really no rationale behind it other than the variants that we happen to have styles for today, the extra classes won't hurt anybody, and it'll work if we decide to add styles for them later.