Project picker fails when selecting $HOME after another FFF picker is initialized #31555

Description

The web project picker can fail when selecting or searching $HOME if OpenCode has already initialized an FFF picker for another directory.

The relevant code in packages/core/src/filesystem/search.ts says home scanning should be allowed when the user opened OpenCode at $HOME or explicitly asked to search there:

// only the first toolcall picker can accumulate resources to index
// home directory, if the user specifically opened opencode at the
// $HOME level or asked it to search there on purpose, otherwise fallback
enableHomeDirScanning: isFirstPicker,

But the implementation only checks whether this is the first picker. That covers opening OpenCode at $HOME, but not selecting $HOME later from the project picker.

In my repro, OpenCode initialized FFF for project directories first, then later tried $HOME from the picker:

creating instance directory=/home/user/project-a
creating instance directory=/home/user/project-b
creating instance directory=/home/user
fff init failed dir=/home/user error="Failed to init file picker: Can not run certain FFF features in a file system root or home directories. Consider smaller per-project directories."

Since $HOME was not the first picker, OpenCode passed enableHomeDirScanning: false, and FFF rejected the request.

Plugins

N/A

OpenCode version

1.16.2

Steps to reproduce

1. Start OpenCode in a project under $HOME.
2. Open the web UI project picker.
3. Select or search from $HOME after another project picker has already been initialized.
4. Observe the picker request fail.

Screenshot and/or share link

No response

Operating System

Ubuntu 22.04

Terminal

Ghostty