Show Local URL in dev info when no App URL is available

[isaacroldan]

WHY are these changes introduced?

When running dev, the App info tab showed only the public App URL. For setups where no public App URL is available (e.g. extension-only apps), there was no way to see the URL used to serve the local extensions.

WHAT is this pull request doing?

• Adds localURL (the proxy URL from network config) through dev.ts → renderDev → DevSessionUI.
• In the App info tab, shows App URL when available, otherwise falls back to Local URL. The two are mutually exclusive — never both.
• Adds tests covering each branch of the fallback.

How to test your changes?

1. Run dev against an app/config where the public App URL is set → App info tab shows App URL: only.
2. Run dev in a setup without a public App URL → App info tab shows Local URL: only.

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

[isaacroldan]

• Show Local URL in dev info when no App URL is available #7541 👈 (View in Graphite)
• main

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[Copilot]

Pull request overview

This PR improves the dev interactive “App info” tab by surfacing a usable URL even when no public App URL is configured (e.g., extension-only apps), by falling back to the local proxy URL.

Changes:

• Plumbs localURL (from config.network.proxyUrl) through dev.ts → renderDev → DevSessionUI.
• Updates the App info tab to show App URL when present, otherwise show Local URL (mutually exclusive).
• Adds unit tests covering both branches of the App URL vs Local URL rendering logic.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/app/src/cli/services/dev/ui/components/DevSessionUI.tsx	Adds localURL prop and renders “Local URL” only when no appURL is provided.
packages/app/src/cli/services/dev/ui/components/DevSessionUI.test.tsx	Adds coverage to ensure Local URL is hidden when App URL exists, and shown when App URL is absent.
packages/app/src/cli/services/dev/ui.tsx	Threads the optional localURL through renderDev into DevSessionUI.
packages/app/src/cli/services/dev.ts	Sources localURL from config.network.proxyUrl when launching dev UI.
.changeset/dev-local-url-fallback.md	Adds a patch changeset documenting the user-facing change.

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