Add tab content adapters

[ncarazon]

Related to #4638

This PR adds tab content adapters for the new question page shell, so the desktop tab bar can render the right panel for the active tab.

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[github-actions]

Cleanup: Preview Environment Removed

The preview environment for this PR has been destroyed.

Resource	Status
🌐 Preview App	Deleted
🗄️ PostgreSQL Branch	Deleted
⚡ Redis Database	Deleted
🔧 GitHub Deployments	Removed
📦 Docker Image	Retained (auto-cleanup via GHCR policies)

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Cleanup triggered by PR close at 2026-04-28T09:02:46Z