The board settings sheet — setup leaves the popover for a home a stray click can't dismiss

The popover/sheet split lands: a board-scoped, titled, sectioned sheet on
the board window hosts everything setup-shaped, opened from the popover's
Board Settings… row and the new Board ▸ Board Settings… menu row. The three
existing setup controls relocate — add-git (whose noteFormVisible lines now
make the sheet the form-anchored failure surface), branch creation (a
standing field; create-and-switch runs the identical settle sequence), and
the commit-identity fields (the 2s visibility-scoped poll rides with them).
The popover keeps the daily face and its postures; its Pro/mode-none
section becomes header + door (.addGit renamed .noRepository). Availability
is derived from the section inventory (Pro + mode none or git), so pro-m2's
sections can't drift from the doors; the sheet's fields join the
caret-chord disable set. The audit suite pins what the free fixture can
reach; the sheet's own audit is manual until a tier override is ruled.

Claude-Session: https://claude.ai/code/session_01CqjXB7ASoWtbyoGod68k97

Kanban/App/BoardWindowHost.swift

@@ -57,6 +57,12 @@ struct BoardWindowHost: View {
     /// menu item through the focus system, like the store.
     @State private var boardInfo = BoardInfoPresentation()
 
+    /// This window's board settings sheet, open or not (03-board-ui.md § Board settings sheet).
+    /// `@State` for `boardInfo`'s reason — one per window — and published the same way, because
+    /// Board ▸ Board Settings… is a menu-bar item that has to reach the frontmost board window, and
+    /// because the sheet is presented *on this window* and modal to it.
+    @State private var boardSettings = BoardSettingsPresentation()
+
     /// This window's purge alert, open or not (03-board-ui.md § Trash). `@State` for `boardInfo`'s
     /// reason and reaching the menu bar the same way: File ▸ Delete (landing on a trash selection)
     /// and Empty Trash… are menu-bar items, and a menu item cannot present anything of its own.
@@ -197,6 +203,17 @@ struct BoardWindowHost: View {
             .onChange(of: boardSearch.isFocused) { _, _ in
                 boardSearch.dismissTransientIfCleared(query: store.searchQuery)
             }
+            // **The board settings sheet** (03-board-ui.md ▸ Board settings sheet) — presented from
+            // the board window's own content, which is what makes it modal to *this* board rather
+            // than to the app: "a board-scoped, titled, sectioned sheet on the board window".
+            //
+            // It hangs here rather than inside `BoardView` for the reason the popover's flag is a
+            // window's: the two doors that open it are the titlebar popover's row and a menu-bar
+            // item, neither of which is inside the board, and a sheet has to be presented by
+            // something that outlives the surface that asked for it.
+            .sheet(isPresented: $boardSettings.isPresented) {
+                BoardSettingsSheet(store: store, presentation: boardSettings)
+            }
             // "The board in front", for the menu items that act on it (`LaneWidthCommands`), and
             // beside it the window's own popover flag, which is what File ▸ Board Info toggles, its
             // purge-alert host, which the trash's two confirmed commands raise, and its search
@@ -207,6 +224,7 @@ struct BoardWindowHost: View {
             // is keyed on the window rather than on the board it is showing.
             .focusedSceneValue(\.boardWindowRef, ref)
             .focusedSceneValue(\.boardInfo, boardInfo)
+            .focusedSceneValue(\.boardSettings, boardSettings)
             .focusedSceneValue(\.trashConfirmations, trashConfirmations)
             // Board ▸ Open Card's second half — the same closure `BoardView` gets, so the menu item
             // and the double-click open one window per card by construction.
@@ -694,13 +712,21 @@ struct BoardWindowHost: View {
         // happen on this path — `beginSession` precedes `configureWindow` — and reads as the free
         // tier's posture, which is the harmless direction.
         let session = appModel.session(for: ref)
+        // The settings sheet's two doors validate on the same pair, so they are adopted here rather
+        // than read again somewhere else: the popover's Board Settings… row and Board ▸ Board
+        // Settings… must never disagree about whether this board has setup to show
+        // (`BoardSettingsAvailability`). The mode *inside* the git state stays live — add-git flipping
+        // it re-resolves the sheet's sections and both doors, which is the one mid-session transition
+        // 06 sanctions.
+        boardSettings.adopt(tier: session?.tier ?? .free, git: session?.git)
         windowController.installTitlebarAccessory(
             boardInfoTitlebarAccessory(
                 store: store,
                 recents: appModel.styleRecents,
                 tier: session?.tier ?? .free,
                 git: session?.git,
-                presentation: boardInfo
+                presentation: boardInfo,
+                settings: boardSettings
             )
         )
         // The widget above now says the board's name (and, on a git-mode Pro board, its branch)