Implement V3 PATCH/DELETE wrappers and migrate Journals module to full V3 CRUD.

- Added update_ae_obj_v3, update_nested_obj_v3, delete_ae_obj_v3, and delete_nested_ae_obj_v3.
- Refactored Journals and Journal Entries modules to utilize the new V3 API wrappers.
- Standardized data processing and IDB caching for all CRUD operations in Journals.
- Updated testing page with comprehensive V3 CUD test buttons.

src/routes/testing/+page.svelte

@@ -76,6 +76,48 @@
         v3_test_result = result;
         console.log('V3 Create Nested Result:', result);
     }
+
+    async function test_v3_update_nested() {
+        console.log('*** test_v3_update_nested() ***');
+        v3_test_result = 'loading...';
+
+        // Test updating the journal entry we just created
+        // ID is from the previous step result: nKiyj0JV5CY
+        const result = await api.update_nested_obj_v3({
+            api_cfg: $ae_api,
+            parent_type: 'journal',
+            parent_id: 'JGEB-80-92-50',
+            child_type: 'journal_entry',
+            child_id: 'nKiyj0JV5CY',
+            fields: {
+                name: 'Test V3 Nested Update - UPDATED',
+                content: 'This was UPDATED using the new V3 nested update wrapper!'
+            },
+            log_lvl: 1
+        });
+
+        v3_test_result = result;
+        console.log('V3 Update Nested Result:', result);
+    }
+
+    async function test_v3_delete_nested() {
+        console.log('*** test_v3_delete_nested() ***');
+        v3_test_result = 'loading...';
+
+        // Test soft deleting (disabling) the journal entry we just updated
+        const result = await api.delete_nested_ae_obj_v3({
+            api_cfg: $ae_api,
+            parent_type: 'journal',
+            parent_id: 'JGEB-80-92-50',
+            child_type: 'journal_entry',
+            child_id: 'nKiyj0JV5CY',
+            method: 'disable', // Sets enable = false
+            log_lvl: 1
+        });
+
+        v3_test_result = result;
+        console.log('V3 Delete (Disable) Nested Result:', result);
+    }
 </script>
 
 <div class="container h-full mx-auto flex flex-col justify-center items-center p-4 gap-4">
@@ -92,6 +134,12 @@
             <button class="btn variant-filled-tertiary" onclick={test_v3_create_nested}>
                 Test V3 Create Nested
             </button>
+            <button class="btn variant-filled-warning" onclick={test_v3_update_nested}>
+                Test V3 Update Nested
+            </button>
+            <button class="btn variant-filled-error" onclick={test_v3_delete_nested}>
+                Test V3 Delete (Disable) Nested
+            </button>
         </div>
     </div>