feat(text): add Text component with typography role variants

[wemra3]

Motivation

#572 added typography role tokens. This PR adds a Text component on top of them (tailor-inc/platform-planning#1580). variant sets the look, and the render prop sets the element, so the heading level no longer decides the text size. No existing component changes.

Where this fits

1. feat(theme): add typography role tokens #572 (merged): role tokens and text-<role> utilities.
2. This PR: Text for application code. Role names are type-checked. A misspelled utility such as text-label-mdd produces no CSS and no error.
3. Next PR: AppShell's own components use the roles. This is where the visible benefit appears. It mostly changes the classes on elements the components already render, so it uses the utilities more than Text.

Design Decision

• variant holds the role. It is not called role, because role is an ARIA attribute. render sets the element, as in Button.
• Default elements: heading roles render h2, body roles render p, and label and code roles render span. All headings share one default, so the size does not suggest a level.
• Color and modifiers such as leading-none stay in className. code-sm adds font-mono.
• Text does not export a cva function such as textVariants. #1580 asked for a variants export, but the text-<role> utility already covers that use. It can be added later without a breaking change.
• jsx-a11y/heading-has-content reports render={<h3 />} as an empty heading. The docs show an eslint-disable-next-line comment for this, instead of adding a second way to set the element, such as a level prop.

The reasons for each decision are in decisions/typography-roles.md.

Question for reviewers

The cream and bloom palettes set the line height and letter spacing of h1 to h6 outside any @layer, so these headings ignore leading-none. Should this rule move into a layer, or be removed, before the next PR applies the roles to headings?

🤖 Generated with Claude Code

[github-actions]

Code Metrics Report

	main (95bc8f2)	#594 (5da98aa)	+/-
Coverage	88.7%	88.7%	+0.0%
Test Execution Time	2m21s	2m26s	+5s

Details

  |                     | main (95bc8f2) | #594 (5da98aa) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          88.7% |          88.7% | +0.0% |
  |   Files             |            208 |            210 |    +2 |
  |   Lines             |           6285 |           6289 |    +4 |
+ |   Covered           |           5575 |           5579 |    +4 |
- | Test Execution Time |          2m21s |          2m26s |   +5s |

Code coverage of files in pull request scope (0.0% → 100.0%, patch 100.0%)

Files	Coverage	+/-	Patch Coverage	Status
packages/core/src/components/text/index.ts	0.0%	0.0%	-	added
packages/core/src/components/text/text.tsx	100.0%	+100.0%	100.0%	added
packages/core/src/index.ts	0.0%	0.0%	-	modified

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Reported by octocov