The whole board-name area opens the popover — the chevron alone was the trigger

The titlebar widget grows from a 20×18 chevron into one button saying
the board's name and, on a git-mode Pro board, its branch — click
anywhere across it and the popover opens as before, anchored to the
widget. BoardInfoTitlebarSummary is the pure seam for both strings
(title falls back to the folder name per 01's naming rule; branch only
under pro + git mode, live off the observable HistoryStore.branch).
Board windows now hide the system title display through the same
hideTitle slot card windows adopted — the widget says the name, so the
chrome would only repeat it — while navigationTitle keeps feeding
window.title to the Window menu, Exposé, VoiceOver and restoration.

The widget also refreshes the branch eagerly at appearance: it used to
populate only once the popover had been opened, which would have left
the new branch line empty on a freshly opened board.

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

Kanban/App/BoardWindowHost.swift

@@ -300,6 +300,13 @@ struct BoardWindowHost: View {
                 presentation: boardInfo
             )
         )
+        // The widget above now says the board's name (and, on a git-mode Pro board, its branch)
+        // itself, so the system title display would only repeat it — the card-window seam
+        // (`CardWindowHost.configureWindow`, `HostedWindowController.hideTitle`), applied here for
+        // the same reason. `.navigationTitle(windowTitle)` a few lines up in `body` is untouched —
+        // `window.title` keeps feeding the Window menu, Exposé, VoiceOver and restoration; only the
+        // title bar's own rendering of that string is suppressed.
+        windowController.hideTitle()
 
         // The board's customizable toolbar (03-board-ui.md ▸ Toolbar) — installed here for the
         // accessory's reason exactly: it carries the store, and it is a board window's, not every