fix(ui): remove duplicate list-settings context menu entry

List settings were reachable via three doors (header button, context
menu, double-click). Drop the context menu entry, matching the same
cut already made for the "Let Claude handle it" entry point.

src/ClaudeDo.Localization/locales/en.json

@@ -194,7 +194,6 @@
     "settingsTip": "Settings",
     "smartListsLabel": "SMART LISTS",
     "myListsLabel": "MY LISTS",
-    "contextSettings": "Settings...",
     "contextWorktrees": "Worktrees…",
     "contextOpenExplorer": "Open in Explorer",
     "contextOpenTerminal": "Open in Terminal",