[imfing]

Summary

• Dim reviewed files in the sidebar file tree (50% opacity). Clears automatically when a file is unmarked or its diff changes.
  • @pierre/trees has no per-row styling API and unsafeCSS is fixed at creation, so SidebarTree injects a small <style> into the tree's open shadow root targeting [data-item-path="…"], deferred one frame because the shadow root attaches after mount.
  • DiffView now computes the reviewed set once and derives hiddenReviewedNames from it.
• Resizable sidebar: drag handle on the right edge, clamped to 200–640px, persisted in localStorage (diffs-sidebar-width); double-click resets to 320px.

Testing

• tsc, oxlint, oxfmt --check pass.
• Verified in the built app with headless Chrome: reviewed row dims to 0.5, persists across Files/Comments tab switch and reload; drag resizes 320→460px and the width persists across reload.