Library: title-strip tabs, one library, no side rail

CONTEXT.md

@@ -41,6 +41,14 @@ each page held for the step duration with full-fidelity page transitions
 between them.
 _Avoid_: video sequencing, movie export
 
+**Library tab**:
+One of the three destinations in the library's title strip. *My Library* is
+the user's own strategies and folders from every store, shown together;
+*Shared* is what teammates shared with them; *Community* is the public space.
+Whether a strategy is on this device, in the cloud, or both is a badge on the
+strategy, not a place the user goes.
+_Avoid_: This Computer, workspace (in user-facing copy)
+
 **Lineup**:
 A saved ability setup (position/aim reference) attached to a page, grouped
 into lineup groups.

DESIGN.md

@@ -116,6 +116,11 @@ components:
     textColor: "{colors.tactical-foreground}"
     rounded: "{rounded.panel}"
     width: "345px"
+  title-strip:
+    backgroundColor: "{colors.tactical-card}"
+    textColor: "{colors.tactical-foreground}"
+    height: "40px"
+    controlHeight: "28px"
   folder-card:
     backgroundColor: "{colors.tactical-card}"
     textColor: "{colors.tactical-foreground}"
@@ -135,6 +140,11 @@ Icarus is a tactical workbench: dark, dense, map-first. The canvas and the tacti
 - Spacing uses the 8/10/12/16/24px steps from the frontmatter. Radii: 8px controls, 12px panels, 16px cards, 22px dialogs.
 - Transitions run 150-250ms and must communicate a state change (hover, selection, reveal, loading). No motion for its own sake.
 
+## Window chrome
+
+- Desktop builds hide the native title bar. Each top-level screen draws its own 40px strip (`lib/widgets/window_chrome.dart`): macOS keeps its traffic lights, so the strip leaves a 78px inset on the left; Windows and Linux get app-drawn caption buttons on the right; the strip is the drag handle. Web renders the same strip with no inset and no buttons.
+- The library strip holds the three tabs on the left and only search, sort, New, and the account on the right. Nothing else goes in it. Inside a folder, the breadcrumb lives in the content area, not the strip.
+
 ## Named rules
 
 **The One Command Color Rule.** Violet marks current action, selection, focus, and primary commands — nothing else. If violet appears somewhere that isn't actionable or active, it's wrong.

TODO.md

@@ -24,11 +24,12 @@ expansion (`custom_search_field.dart`), shimmer skeleton (`strategy_view_skeleto
 
 ## 2. Folder navigator side rail — `lib/widgets/folder_navigator_sidebar.dart`
 
-> Note: verification revealed `FolderNavigatorSidebar` is not mounted anywhere —
-> the visible rail is `_LibraryNavigationRail` in `folder_navigator.dart`. Both
-> were slimmed (sidebar 288→240px / rail 226→184px, smaller icons, single-line
-> labels with tooltips). Mounting or deleting the unused sidebar widget is a
-> separate product decision.
+> Superseded (2026-09): the hover rail and the never-mounted sidebar are gone.
+> The library's only chrome is now the title strip
+> (`lib/widgets/library_title_strip.dart`) with three tabs: My Library, Shared,
+> Community. "This Computer" is no longer a place; local strategies sit in
+> My Library next to cloud ones with an "On this device" badge. The items below
+> are kept for history.
 
 - [x] Narrow the panel (~288px → ~240px); reduce top-stack chrome
 - [x] Collapse the two stacked sort selects into one compact row (or move sorting into
@@ -124,6 +125,6 @@ Outstanding follow-ups:
   against the current deployment. Likely deployment skew — this branch's
   typed-payload Convex functions haven't been deployed. Deploy `convex/`
   together with merging this branch, then re-verify opening cloud strategies.
-- `FolderNavigatorSidebar` remains unmounted (see §2 note).
+- `FolderNavigatorSidebar` was deleted with the rail (see §2 note).
 - Cloud "Create Cloud Strategy" goes straight to an Ascent editor with no map
   picker (matches local create behavior — decide if a picker is wanted).