HAPI Chat 0.5.6: dismiss repeated composer tips

Embedded chats no longer repeat HAPI's composer onboarding popovers with the Got it button in every new window. Scratchlists and rich mentions remain available; regular browser tabs keep their normal onboarding.

Install from the Visual Studio Marketplace, Open VSX, or the VSIX below. The extension README and the upstream HAPI integration PR now link to the Microsoft Marketplace.

Validation: 33 tests, JavaScript syntax checks, VS Code host CI, and native HAPI browser checks passed. Run Developer: Reload Window after updating.