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+---
+epic: 7
+story: 7.6
+title: "Sheets Sidebar"
+status: draft
+---
+
+## Epic 7 — macOS App (Swift/SwiftUI)
+**Goal:** A beautiful, native macOS app that feels like it belongs on the platform.
+
+### Story 7.6: Sheets Sidebar
+
+As a **macOS user**,
+I want a sidebar that lists my sheets and folders,
+So that I can organize, navigate, and manage multiple calculation documents easily.
+
+**Acceptance Criteria:**
+
+**Given** the app is launched with multiple saved sheets
+**When** the main window appears
+**Then** a `NavigationSplitView` sidebar on the left shows all sheets and folders in a tree structure
+
+**Given** the sidebar is visible
+**When** the user clicks on a sheet name
+**Then** the two-column editor loads that sheet's content
+
+**Given** multiple sheets exist in the sidebar
+**When** the user drags a sheet to a new position
+**Then** the sheet reorders in the sidebar and the new order persists
+
+**Given** a sheet exists in the sidebar
+**When** the user swipes left on the sheet name (trackpad gesture)
+**Then** a delete action is revealed; confirming it deletes the sheet
+
+**Given** a sheet or folder exists in the sidebar
+**When** the user right-clicks (or Control-clicks) on the item
+**Then** a context menu appears with options such as Rename, Duplicate, Move to Folder, Delete
+
+**Given** the user creates a new folder in the sidebar
+**When** the user drags sheets into that folder
+**Then** the sheets appear nested under the folder, and the folder can be collapsed/expanded