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/de.json

@@ -194,7 +194,6 @@
     "settingsTip": "Einstellungen",
     "smartListsLabel": "INTELLIGENTE LISTEN",
     "myListsLabel": "MEINE LISTEN",
-    "contextSettings": "Einstellungen...",
     "contextWorktrees": "Worktrees…",
     "contextOpenExplorer": "Im Explorer öffnen",
     "contextOpenTerminal": "Im Terminal öffnen",