Run pnpm doc to generate TypeDoc documentation for version 7.0.0,
update docs/index.md landing page, and update the latest redirect.
This fixes the check-version CI failure.

Co-authored-by: Greg Nazario <greg@gnazar.io>

tsup's sucrase CJS transformer generates invalid syntax (semicolons inside
`if()` conditions) when esbuild preserves ES2022 class fields. This
manifests as `SyntaxError: Unexpected token ';'` when loading the CJS
bundle. Fix by keeping CJS target at es2020 (so esbuild downlevels class
fields before sucrase processes them) while ESM stays at es2022.

Also fix a multiline template literal in multiKey.ts that was cosmetic
but could cause similar bundler issues.

Co-authored-by: Greg Nazario <greg@gnazar.io>

@aptos-labs/aptos-client@3.0.1 declares undici as an optional peer
dependency but unconditionally requires it in the CJS node entry point.
Add undici ^7.24.1 to the SDK's dependencies so it's available at
runtime for consumers.

Co-authored-by: Greg Nazario <greg@gnazar.io>

aptos-client v3 returns Fetch API Headers objects instead of plain
objects for response.config.headers. Update all client test assertions
to use Headers.get() instead of toHaveProperty() / direct property
access.

- post.test.ts: use headers.get() for all header assertions
- aptosRequest.test.ts: use headers.get() for header/api-key assertions
- get.test.ts: restructure to verify headers on successful response
  instead of inspecting error properties
- errors/index.ts: handle Headers object when reading traceparent for
  error messages

Co-authored-by: Greg Nazario <greg@gnazar.io>