fix(vscode): harden workspace evaluation fallback (#474)

* fix(vscode): harden workspace evaluation fallback

VS Code evals could fail even when the right folder was open because the
OpenProject helper file was never written or fetched. Refocus VS Code before
running the palette command, then fall back to reading workspaceStorage so the
evaluator can still recover the open project path.

Made-with: Cursor

* fix(vscode): remove redundant fallback guard

The workspaceStorage fallback is already a no-op when no Linux path exists, so
the extra MacOS early return only made the control flow harder to follow.
Removing it keeps the getter behavior aligned with the current local change.

Made-with: Cursor