docs: update ts-config override examples

docs/plugins/Explorer.md

@@ -16,11 +16,20 @@ See [[plugins/Explorer]] for detailed usage information.
 
 This plugin accepts the following configuration options:
 
+**YAML options** (in `quartz.config.yaml`):
+
 - `title`: The title of the explorer. Defaults to `Explorer`.
 - `folderClickBehavior`: The behavior when a folder is clicked. Can be `"link"` to navigate or `"collapse"` to toggle. Defaults to `collapse`.
 - `folderDefaultState`: The default state of folders. Can be `"collapsed"` or `"open"`. Defaults to `collapsed`.
 - `useSavedState`: Whether to use local storage to save the state of the explorer. Defaults to `true`.
 
+**TS override options** (in `quartz.ts`, for callback functions that can't be expressed in YAML):
+
+- `sortFn`: Custom sort function for ordering files and folders.
+- `filterFn`: Custom filter function to exclude specific nodes.
+- `mapFn`: Custom map function to transform node properties (e.g. display names).
+- `order`: Array controlling the order of operations. Defaults to `["filter", "map", "sort"]`.
+
 ### Default options
 
 ```yaml title="quartz.config.yaml"
@@ -33,6 +42,21 @@ This plugin accepts the following configuration options:
     useSavedState: true
 ```
 
+### TS override example
+
+```ts title="quartz.ts"
+import * as ExternalPlugin from "./.quartz/plugins"
+
+ExternalPlugin.Explorer({
+  mapFn: (node) => {
+    node.displayName = node.displayName.toUpperCase()
+    return node
+  },
+})
+```
+
+See [[features/explorer#Advanced customization]] for more examples.
+
 ## API
 
 - Category: Component