fix(solid-router): preserve caller roles on enabled links

[Fnine59]

Fixes #8106.

Problem

useLinkProps copies DOM-safe caller props onto the returned object, then replaces role with a getter that resolves to undefined whenever the link is enabled. That replacement removes a caller-provided role from the rendered anchor.

Fix

Keep the disabled-link override (role="link"), but otherwise read role from the caller props. Reading it in the getter preserves Solid's reactive prop semantics.

Tests

• Added coverage for an enabled link retaining role="button", a disabled link forcing role="link", and restoring the caller role when re-enabled.
• Ran the complete Solid Router Link test file (130 tests).
• Ran the Solid Router build and TypeScript 5.6-7.0 type-test matrix.
• Ran the Solid Router ESLint target and focused Prettier checks.

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