fix(devtools): QA feedbacks on the realistic UI preview

[harijoe]

Summary

• Fixes the QA findings on the DevTools realistic conversation preview (session notes, SKY-557).
• A modal requested via useRequestModal can now be closed; before, nothing could dismiss it on either client.
• Leaving fullscreen keeps the widget in view instead of jumping to the top of the thread.
• Preview skeletons no longer pulse, so the mock conversation stops looking like it is loading.
• Adds host chrome QA asked for: logos in the switch button, the composer in fullscreen, Claude's scroll-to-bottom arrow.
• vite.config.ts files use import.meta.dirname, dropping the config-loader warning new projects printed.

Architecture Notes

• Modal lifecycle sits with the host — the openai mock clears openai.view, so isOpen flips from the store, not from the component.

Alternatives Considered

• Expose close from useRequestModal — would let the view dismiss its own modal. No real host needs it: ChatGPT owns the chrome, and on an MCP Apps host window.openai is undefined so core's polyfill already closes itself. That would have added permanent v2 public API to paper over a DevTools-only gap.
• Show the resolved Skybridge version in the DevTools header — was built, then reverted. QA's "stuck at v1.0.0" is the CLI banner, which already reads the installed package correctly; the repo pins 1.0.0 and injects the real version at publish time, so in-repo runs always print it. Nothing to fix, and the header was the wrong home for it.

[greptile-apps]

Greptile Summary

The PR incorporates QA feedback for the realistic DevTools conversation preview.

• Replaces __dirname with import.meta.dirname in Vite configurations and migration guidance.
• Stops preview skeletons from pulsing and restores bottom positioning after fullscreen.
• Adds host-driven modal rendering, Escape handling, close controls, and view-state synchronization.
• Reverts the attempted Skybridge package-version header after its initial implementation.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains.

_{Reviews (2): Last reviewed commit: "revert(devtools): drop the skybridge ver..." | Re-trigger Greptile}