feat(recipe): Save and Save As for recipes

Custom recipes can be overwritten in place (TopBar SAVE now offers CANCEL /
SAVE AS / SAVE and prefills the current name); bundled recipes stay read-only
and only offer Save As. Adds updateCustomRecipe to storageUtils.

App.tsx

@@ -17,7 +17,7 @@ import SettingsModal from './src/components/SettingsModal';
 import PhotoViewerModal from './src/components/PhotoViewerModal';
 
 import { Recipe, ColorAdjustments, CustomWatermark, GpsWatermark, FrameId, GPSInfo, AspectRatio, MeterMode, PhotoEntry, ShutterSound, StartupMode, CropRatio, CropRect, CROP_W_H, DEFAULT_CROP_RECT } from './src/types';
-import { getAllRecipes, saveCustomRecipe, deleteCustomRecipe } from './src/utils/storageUtils';
+import { getAllRecipes, saveCustomRecipe, updateCustomRecipe, deleteCustomRecipe } from './src/utils/storageUtils';
 import { DEFAULT_ADJUSTMENTS, FILM_SIMS, filmSimToRecipe } from './src/utils/defaultRecipes';
 import { getCurrentGPS, requestLocationPermissions, reverseGeocode } from './src/utils/locationUtils';
 import { resolvePhotoGPS } from './src/utils/photoGps';
@@ -639,6 +639,23 @@ export default function App() {
     Alert.alert('Recipe Saved', `"${name}" has been created.`);
   };
 
+  // TopBar "SAVE" on a user-created recipe: overwrite it in place, same id.
+  const handleOverwriteRecipe = async (name: string) => {
+    if (!selectedRecipe) return;
+    await updateCustomRecipe(selectedRecipe.id, {
+      name,
+      baseFilter: selectedRecipe.baseFilter,
+      adjustments,
+      frameId: selectedFrame,
+      useGeotag,
+    });
+    const list = await getAllRecipes();
+    setRecipes(list);
+    const updated = list.find((r) => r.id === selectedRecipe.id);
+    if (updated) applyRecipe(updated);
+    Alert.alert('Recipe Updated', `"${name}" has been saved.`);
+  };
+
   // PRESETS → CREATE quick-input: build a brand-new recipe from the modal's
   // typed fields, persist it, and apply it (the user sees the look immediately).
   const handleCreateRecipe = async (recipe: Omit<Recipe, 'id' | 'isCustom'>) => {
@@ -1160,7 +1177,12 @@ export default function App() {
       </View>
 
       {/* Top overlay: mode label + recipe name (left), Save current (right) */}
-      <TopBar mode={mode} recipeName={activeRecipe.name} onSaveRecipe={handleSaveRecipe} />
+      <TopBar
+        mode={mode}
+        recipeName={activeRecipe.name}
+        onSaveRecipe={handleSaveRecipe}
+        onOverwriteRecipe={selectedRecipe?.isCustom ? handleOverwriteRecipe : undefined}
+      />
 
       {/* Bottom deck: chip panel (progressive disclosure) -> tool rail -> shutter */}
       <View

src/components/TopBar.tsx

@@ -8,22 +8,34 @@ interface TopBarProps {
   mode: 'camera' | 'library';
   recipeName: string;
   onSaveRecipe: (name: string) => void;
+  // Present only when the active recipe is user-created: enables Save (overwrite).
+  onOverwriteRecipe?: (name: string) => void;
 }
 
-export default function TopBar({ mode, recipeName, onSaveRecipe }: TopBarProps) {
+export default function TopBar({ mode, recipeName, onSaveRecipe, onOverwriteRecipe }: TopBarProps) {
   const insets = useSafeAreaInsets();
   const [modalVisible, setModalVisible] = useState(false);
   const [newRecipeName, setNewRecipeName] = useState('');
 
-  const handleSavePress = () => {
+  const openModal = () => {
+    // Bundled recipes are read-only -> Save As only, blank name. Custom ones
+    // prefill with the current name so Save (overwrite) is one tap.
+    setNewRecipeName(onOverwriteRecipe ? recipeName : '');
+    setModalVisible(true);
+  };
+
+  const run = (fn: (name: string) => void) => {
     const name = newRecipeName.trim();
     if (!name) return;
-    onSaveRecipe(name);
+    fn(name);
     setNewRecipeName('');
     setModalVisible(false);
     Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light);
   };
 
+  const handleSavePress = () => run(onSaveRecipe);
+  const handleOverwritePress = () => onOverwriteRecipe && run(onOverwriteRecipe);
+
   return (
     <>
       <View
@@ -43,7 +55,7 @@ export default function TopBar({ mode, recipeName, onSaveRecipe }: TopBarProps)
         </View>
 
         <TouchableOpacity
-          onPress={() => setModalVisible(true)}
+          onPress={openModal}
           className="flex-row items-center rounded-full border border-zinc-700/80 bg-black/45 px-4 py-2.5"
           activeOpacity={0.7}
         >
@@ -67,7 +79,7 @@ export default function TopBar({ mode, recipeName, onSaveRecipe }: TopBarProps)
         >
           <View style={{ paddingBottom: insets.bottom + 16 }} className="mt-auto bg-titan border-t border-zinc-800 rounded-t-3xl p-6">
             <Text className="text-white font-mono text-sm font-bold tracking-wider mb-4">
-              SAVE CURRENT AS RECIPE
+              {onOverwriteRecipe ? 'SAVE RECIPE' : 'SAVE CURRENT AS RECIPE'}
             </Text>
             <TextInput
               value={newRecipeName}
@@ -85,12 +97,29 @@ export default function TopBar({ mode, recipeName, onSaveRecipe }: TopBarProps)
               >
                 <Text className="text-zinc-300 font-mono text-xs font-semibold">CANCEL</Text>
               </TouchableOpacity>
-              <TouchableOpacity
-                onPress={handleSavePress}
-                className="flex-1 bg-amber-500 py-3 rounded-lg items-center"
-              >
-                <Text className="text-black font-mono text-xs font-bold">SAVE RECIPE</Text>
-              </TouchableOpacity>
+              {onOverwriteRecipe ? (
+                <>
+                  <TouchableOpacity
+                    onPress={handleSavePress}
+                    className="flex-1 border border-amber-500 py-3 rounded-lg items-center"
+                  >
+                    <Text className="text-amber-500 font-mono text-xs font-bold">SAVE AS</Text>
+                  </TouchableOpacity>
+                  <TouchableOpacity
+                    onPress={handleOverwritePress}
+                    className="flex-1 bg-amber-500 py-3 rounded-lg items-center"
+                  >
+                    <Text className="text-black font-mono text-xs font-bold">SAVE</Text>
+                  </TouchableOpacity>
+                </>
+              ) : (
+                <TouchableOpacity
+                  onPress={handleSavePress}
+                  className="flex-1 bg-amber-500 py-3 rounded-lg items-center"
+                >
+                  <Text className="text-black font-mono text-xs font-bold">SAVE RECIPE</Text>
+                </TouchableOpacity>
+              )}
             </View>
           </View>
         </KeyboardAvoidingView>

src/utils/storageUtils.ts

@@ -35,6 +35,13 @@ export async function saveCustomRecipe(recipe: Omit<Recipe, 'id' | 'isCustom'>):
   return newRecipe;
 }
 
+// Overwrite an existing custom recipe in place (Save). No-op if the id is gone.
+export async function updateCustomRecipe(id: string, recipe: Omit<Recipe, 'id' | 'isCustom'>): Promise<void> {
+  const custom = await getCustomRecipes();
+  const updated = custom.map((r) => (r.id === id ? { ...r, ...recipe, id, isCustom: true } : r));
+  await AsyncStorage.setItem(CUSTOM_RECIPES_KEY, JSON.stringify(updated));
+}
+
 export async function deleteCustomRecipe(id: string): Promise<void> {
   const custom = await getCustomRecipes();
   const updated = custom.filter(r => r.id !== id);