feat(review): add Reveal in Finder to the category right-click menu

Picnest/Review/ReviewViewModel.swift

@@ -470,6 +470,16 @@ final class ReviewViewModel {
         revealURLs(urls)
     }
 
+    /// Shows the photos of category `c` in Finder. Does nothing if the category has no photos.
+    func showCategoryInFinder(_ c: CategoryID) {
+        let session = review.session
+        let urls = session.visibleMedia
+            .filter { Self.includes($0, state: session.states[$0.id], in: .category(c)) }
+            .map(url(of:))
+        guard !urls.isEmpty else { return }
+        revealURLs(urls)
+    }
+
     func selectAll() { selection = Set(visibleIDs) }
 
     func clearSelection() {

Picnest/Review/SidebarView.swift

@@ -89,6 +89,9 @@ struct SidebarView: View {
                 }
                 .disabled(model.mergeTargets(for: id).isEmpty)
                 Divider()
+                Button("Reveal in Finder") { model.showCategoryInFinder(id) }
+                    .disabled(model.count(of: .category(id)) == 0)
+                Divider()
                 Button("Delete…", role: .destructive) { deleting = id }
                     .disabled(!model.canDeleteCategory)
             }

PicnestTests/ReviewViewModelTests.swift

@@ -496,6 +496,14 @@ struct ReviewViewModelTests {
         #expect(Set(revealed[0].map(\.lastPathComponent)) == ["a.jpg", "c.jpg"])
     }
 
+    @Test func showCategoryInFinderRevealsThePhotosOfThatCategory() throws {
+        var revealed: [[URL]] = []
+        let model = try makeModelAndReview(revealURLs: { revealed.append($0) }).model
+        model.showCategoryInFinder(food.id)
+        try #require(revealed.count == 1)
+        #expect(Set(revealed[0].map(\.lastPathComponent)) == ["a.jpg", "c.jpg"])
+    }
+
     @Test func selectedURLsAreTheSelection() throws {
         let model = try makeModel()
         #expect(model.selectedURLs().isEmpty)