feat(ui): base branch field in list settings, real branch names in dialogs

src/ClaudeDo.Localization/locales/de.json

@@ -471,6 +471,9 @@
       "folderColorHint": "Färbt den Ordnernamen und seine Führungslinie in der Seitenleiste.",
       "workingDirectory": "Arbeitsverzeichnis",
       "workingDirectoryPlaceholder": "(keines)",
+      "baseBranch": "Basis-Branch",
+      "baseBranchPlaceholder": "(ausgecheckter Branch)",
+      "baseBranchHint": "Neue Task-Branches starten hier, und freigegebene Arbeit wird hierhin gemergt, z.B. dev. Leer = der gerade ausgecheckte Branch.",
       "browse": "Durchsuchen...",
       "defaultCommitType": "Standard-Commit-Typ",
       "manualList": "Manuelle Liste (Erinnerungen)",

src/ClaudeDo.Localization/locales/en.json

@@ -471,6 +471,9 @@
       "folderColorHint": "Tints the folder name and its guide line in the sidebar.",
       "workingDirectory": "Working directory",
       "workingDirectoryPlaceholder": "(none)",
+      "baseBranch": "Base branch",
+      "baseBranchPlaceholder": "(checked-out branch)",
+      "baseBranchHint": "New task branches start here and approved work merges back here, e.g. dev. Leave empty to use whatever branch is checked out.",
       "browse": "Browse...",
       "defaultCommitType": "Default commit type",
       "manualList": "Manual list (reminders)",