Fix 7 bugs: bounds checks, deepcopy, time import, JS keys, unused import

- Add bounds check on src_batch index in add_from_source and copy_source
- Guard delete callback against stale index after rapid clicks
- Replace __import__('time').time() with time.time() in sync_to_db
- Use deepcopy(DEFAULTS) consistently in utils.py and main.py
- Use JSON.stringify in JS onConfigure fallback path for key storage
- Read state.show_comfy_monitor for checkbox initial value
- Remove unused KEY_BATCH_DATA import from tab_projects_ng

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/project_dynamic.js

@@ -251,8 +251,8 @@ app.registerExtension({
             } else if (this.outputs.length > 1) {
                 // Widget values empty but serialized dynamic outputs exist — sync widgets
                 const dynamicOutputs = this.outputs.slice(1);
-                if (okWidget) okWidget.value = dynamicOutputs.map(o => o.name).join(",");
-                if (otWidget) otWidget.value = dynamicOutputs.map(o => o.type).join(",");
+                if (okWidget) okWidget.value = JSON.stringify(dynamicOutputs.map(o => o.name));
+                if (otWidget) otWidget.value = JSON.stringify(dynamicOutputs.map(o => o.type));
             }
 
             this.setSize(this.computeSize());