fix: add missing CodeSdkTabs component from miden-tutorials

[Keinberger]

The deploy workflow (run #22185645208) fails at the "Build site" step after 0xMiden/tutorials#159 was merged. The 4 new web-client tutorial pages import CodeSdkTabs from @site/src/components, but that component doesn't exist in this repo.

The @site alias resolves to the miden-docs repo root, so @site/src/components points to src/components/index.ts here — which only exports CodeTabs. The CodeSdkTabs files do get copied into docs/builder/develop/tutorials/components/ by the aggregation step, but that path is unreachable via @site.

The build logs confirm this:

• export 'CodeSdkTabs' was not found in '@site/src/components' (possible exports: CodeTabs)
• SSG fails for all 4 tutorial pages that use the component

Fix: Copy CodeSdkTabs.tsx and CodeSdkTabs.module.css from miden-tutorials into src/components/ and re-export from src/components/index.ts. This mirrors how CodeTabs already works.