fix(docs): hide inactive SDK variants for java

[pratyush618]

Summary

• The SDK-variant show/hide CSS enumerated only the python/node pairs, so Java variants were never hidden — the architecture overview rendered "Node.jsJava", "N-APIJNI boundary", etc., and with Java active the other SDKs' text also stayed visible
• Replaced the pairwise enumeration with per-SDK :not() rules covering python, node, and java (adding a future SDK now needs a single selector), and extended the tab-highlight rule to java

Test plan

• docs lint + typecheck green

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Review details

⚙️ Run configuration

Configuration used: defaults

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Run ID: baed44ce-6fb1-4aa8-90d5-f7610c2626a6

📥 Commits

Reviewing files that changed from the base of the PR and between 3e15ab6 and ee76583.

📒 Files selected for processing (1)

• docs/app/styles/sdk.css

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/docs-java-sdk-variant

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