tui: @ file picker excludes tracked files under dot-directories on Windows V2

Description

On OpenCode V2 beta for Windows, @ autocomplete omits tracked, non-ignored files when any path segment starts with .. For example, Windows/.config/opencode/opencode.json is visible through /api/fs/list, but /api/fs/find?query=opencode returns no match.

Windows defaults to the ripgrep search backend. Its catch-all index calls ripgrep.find() without hidden: true, effectively running rg --no-config --files without --hidden. This makes file-picker behavior backend-dependent and provides no config or API option to include hidden paths.

This still reproduces after #33976 was automatically closed with an invitation to open a new issue if relevant. The related fix in #34000 was closed without being merged.

Plugins

@ephemushroom/opencode-claude-mem, @ephemushroom/opencode-hermes, oh-my-openagent@beta, opencode-antigravity-auth

OpenCode version

0.0.0-beta-18684

Steps to reproduce

1. On Windows, create a Git repository containing a tracked file such as src/.config/example.json.
2. Confirm the file is not excluded by .gitignore.
3. Start OpenCode V2 in the repository.
4. Type @example.json or its full relative path.
5. Observe that the file is absent from autocomplete.

Screenshot and/or share link

Not available. The issue is consistently reproducible through both the TUI and /api/fs/find.

Operating System

Windows 11 10.0.26200.9168

Terminal

WezTerm