desktop: attachment picker always opens at session directory; no "remember last location" or configurable default #52166

Summary

In the OpenCode desktop app (macOS), clicking the "+" attachment button opens the file picker at the session's working directory every time. There is no way to change this default or have the picker remember the last-used folder, so attaching files from anywhere else requires navigating from scratch on every single attach.

Environment

• opencode version: 2.0.18
• OS: Darwin 25.6.0 (macOS, arm64)
• Terminal: Unavailable: desktop app (GUI), not TUI
• Shell: /bin/zsh
• Install/channel: latest (release)
• Active plugins: None found in config

Reproduction

1. Open a session in the desktop app (session directory: e.g. ~/Documents/Default Project).
2. Click the "+" button to attach a file.
3. Navigate to e.g. ~/Downloads, select a file, attach it.
4. Click "+" again to attach another file.

Expected Behavior

The picker reopens at ~/Downloads (the last-used location), or there is a configurable default directory for the attachment picker (app-wide or per-session setting).

Actual Behavior

The picker always opens at the session's working directory, requiring manual navigation on every attach. Checked V2 docs: no documented CLI or config setting exists for the picker's default directory.

Additional Context

• macOS native open panels typically restore the last-used location automatically, but this behavior appears overridden because the app sets the panel's directory explicitly on each invocation.
• Workarounds in use: typing paths directly into the prompt, or copy/paste from Finder. Both work but the picker flow is the discoverable path.
• Reproduces consistently (every attach, every session).
• Impact is workflow friction for users who attach reference files frequently (documents, exports) from outside the project directory.