desktop: "from <branch>" picker in New Workspace is blank until toggling the project dropdown a few times #51072

Summary

In the opencode v2 desktop app (macOS), opening New Workspace (新建工作区) from the project dropdown shows an empty / missing from <branch> base-branch picker. The picker only renders after toggling the selection in the dropdown a few times. This makes it impossible to know or change which branch a new workspace will be created from until you fiddle with the dropdown.

Environment

• opencode version: v2.0.12 (CLI opencode --version); desktop v2 app
• OS: Darwin 27.0.0 (arm64), macOS
• Terminal: N/A — desktop app
• Shell: /bin/zsh
• Install/channel: latest (desktop)
• Active plugins: none found in ~/.config/opencode/opencode.json

Reproduction

1. Open the v2 desktop app on macOS.
2. Select a normal git project (e.g. eva-evolve) from the project dropdown.
3. Choose 新建工作区 / New Workspace.
4. Observe the right side of the bar (<project> / + 新建工作区): the from <branch> control does not appear / is blank.
5. Switch the selection in the dropdown (move off and back onto New Workspace) a few times.
6. The from <branch> control eventually appears.

Expected Behavior

Selecting New Workspace should immediately render the from <branch> picker, populated with the resolved default base branch (e.g. from main), without needing repeated toggling.

Actual Behavior

On entering New Workspace from the project dropdown, the from <branch> control is missing/empty and only shows up after switching back and forth in the dropdown several times (reproducible every time on this setup). No error is surfaced in the UI.

Additional Context

• Frequency: reproducible every time; the control appears only after a few dropdown toggles.

• Project state: standard git repository (eva-evolve), HEAD on main, multiple local branches, remotes origin and upstream configured, and many existing worktrees under ~/.local/share/opencode/worktree/....

• Server logs (~/.local/share/opencode/log/opencode.log) show that when the project is opened, the server runs the branch listing for the picker, e.g.:

  command=git args="[\"--no-optional-locks\", \"-c\", \"core.autocrlf=false\", ..., \"for-each-ref\", \"--ignore-case\", \"--sort=refname\", \"--sort=-committerdate\", \"--format=%(refname:short)\", \"--count=50\", \"refs/heads\", \"refs/remotes\"]" cwd=/Users/secret/Documents/GitHub/eva-evolve
  

  This suggests the branch data is fetched asynchronously and the control simply does not re-render once it arrives (or renders empty while the request is in flight).

• Also seen in the same log, for context on how the project is resolved:

  level=WARN message="worktree discovery failed" directory=/Users/secret/Documents/GitHub strategy=git error=Worktree.DirectoryUnavailableError
  

• The for-each-ref result for this repo includes bare origin and upstream entries alongside origin/main, main, etc.:
  origin, origin/main, main, feat/tooltip-system, ... (not sure if this is related, but it is unusual).

• Possibly related: new workspace always branches from the current head #39778 (new workspace always branches from the current head) and V2 UI does not support workspaces #39614 (V2 UI does not support workspaces).

• Workaround: toggle the project dropdown selection a few times until the from <branch> control appears.