* fix(vscode): restore sidebar diff viewer parity with Agent Manager
The sidebar diff viewer bundle was missing agent-manager-review.css, so
FullScreenDiffView rendered with a broken file tree (no flex layout, no
revert styles) since PR #7455. Co-locate the CSS imports with the
component so every consumer gets them automatically, and wire per-file
revert end-to-end via a shared WorktreeDiffClient used by both the
sidebar provider and the Agent Manager controller.
* fix(cli): skip flaky shell-completion test on Windows CI
The 'shell completion resumes queued loop callers' test relies on shell
process spawn timing that is unreliable on Windows CI and times out at
3s. Every other shell-process test in this file already uses the
existing `unix(...)` helper for the same reason — align this test
with that pattern.