[PAB-24] Add selectable backend environments

[pablopunk]

This PR adds the ability to select and switch between different backend environments for the Nevermind service, allowing users to connect to either the production backend or a custom backend URL.

Key changes:

1. Backend environment switching — A new "Nevermind: Switch Backend Environment" command is exposed in the account extension, letting users choose between Production or a custom HTTPS URL. The custom URL option prompts the user to enter a backend URL.

2. Validation and security — When switching backends, the custom URL is validated for proper HTTPS format. Packaged builds are blocked from using localhost/loopback addresses. The selected backend must also pass a compatibility manifest check before the switch is accepted.

3. Environment state persistence — The selected backend environment (type and base URL) is stored in user state and persisted across sessions. The auth file now also records which environment was used for sign-in.

4. Seamless re-authentication — Switching backends automatically signs out of the current session, invalidates the old compatibility cache, signs into the new environment, warms the new compatibility cache, disposes existing AI sessions, and broadcasts the auth change to extensions.

5. Compatibility cache invalidation — A new invalidateNevermindCompatibilityCache function allows targeted (by URL) or full cache clearing, ensuring stale manifests don't interfere with backend switches.

6. Sign-in routing — All sign-in paths (extension login, host jobs, etc.) now route through a unified signInToSelectedNevermindEnvironment function that uses the currently selected backend environment rather than a hardcoded default.

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Project	Deployment	Actions	Updated (UTC)
nvm	Ready	Preview, Comment	Jul 12, 2026 3:12pm

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