Fix category handling, recipe management, and dark mode toggle tint

- Map uncategorized category between * (internal) and empty string
  (API) so selecting Sonstige/Other correctly persists to the server
- Default new recipes to Other (*) category and remove None option
- Add "New Category" option to category picker in recipe edit view
- Include newly created/imported recipes in recently viewed list and
  pre-fetch thumbnails so images display immediately
- Remove deleted recipes from recently viewed list
- Remove broad .tint(.primary) from RecipeTabView that caused white
  toggles in Settings during dark mode
- Rename German "Other" translation from Andere to Sonstige
- Add missing translations for Servings stepper and new category strings

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Nextcloud Cookbook iOS Client/Localizable.xcstrings

@@ -494,7 +494,6 @@
       }
     },
     "Add" : {
-      "extractionState" : "stale",
       "localizations" : {
         "de" : {
           "stringUnit" : {
@@ -950,6 +949,28 @@
         }
       }
     },
+    "Category name" : {
+      "localizations" : {
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Kategoriename"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Nombre de categoría"
+          }
+        },
+        "fr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Nom de catégorie"
+          }
+        }
+      }
+    },
     "Category: %@" : {
       "extractionState" : "stale",
       "localizations" : {
@@ -2958,6 +2979,50 @@
         }
       }
     },
+    "New Category" : {
+      "localizations" : {
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Neue Kategorie"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Nueva categoría"
+          }
+        },
+        "fr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Nouvelle catégorie"
+          }
+        }
+      }
+    },
+    "New Category…" : {
+      "localizations" : {
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Neue Kategorie …"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Nueva categoría…"
+          }
+        },
+        "fr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Nouvelle catégorie…"
+          }
+        }
+      }
+    },
     "New recipe" : {
       "extractionState" : "stale",
       "localizations" : {
@@ -3341,7 +3406,7 @@
         "de" : {
           "stringUnit" : {
             "state" : "translated",
-            "value" : "Andere"
+            "value" : "Sonstige"
           }
         },
         "es" : {
@@ -4229,8 +4294,26 @@
       }
     },
     "Servings: %lld" : {
-      "comment" : "A stepper that allows the user to select the number of servings for a recipe. The first argument is a label describing the number of servings. The second argument is a binding to the number of servings, which is",
-      "isCommentAutoGenerated" : true
+      "localizations" : {
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Portionen: %lld"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Porciones: %lld"
+          }
+        },
+        "fr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Portions : %lld"
+          }
+        }
+      }
     },
     "Settings" : {
       "localizations" : {