Fix external controller disposal causing scroll errors

[Copilot]

ChipsInputAutocomplete was disposing externally-provided controllers and focus nodes when scrolled out of view in ListView, causing crashes when parent widgets accessed them later.

Changes

Core Fix (lib/src/chips_input_autocomplete.dart)

• Track ownership of controller and FocusNode with _controllerCreatedInternally and _focusNodeCreatedInternally flags
• Conditionally dispose only internally-created resources in dispose()

Tests (test/chips_input_autocomplete_test.dart)

• Verify external controllers remain usable after widget disposal
• Verify external FocusNodes remain usable after widget disposal
• Verify scrolling behavior in ListView with external controller

Example (example/lib/example_scroll_form.dart)

• Demonstrate usage with external controller in scrollable form

Example

// Before: This would crash when scrolled
final controller = ChipsAutocompleteController();
ListView(
  children: [
    ChipsInputAutocomplete(controller: controller), // ❌ Crashes on scroll
  ],
)

// After: Controller ownership is respected
ListView(
  children: [
    ChipsInputAutocomplete(controller: controller), // ✅ Works correctly
  ],
)

Follows standard Flutter ownership pattern (matches TextField/TextEditingController behavior).

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Error on Scroll if controller property is set</issue_title>
<issue_description>

AutoComplete widget create an error onscroll if the controller property is set.

In order to recreate set Autocomplete is a large form that needs to be scrolled.
It seems like it's disposed or needs rebuilt when it's no longer on screen.

`
Form(
key: formkey,
child: ListView(
shrinkWrap: true,
children: [

                TextField(
                  controller: controllers['CompanyName'],
                  decoration: InputDecoration(
                    hintText: "Name of Company",
                    enabledBorder: AppStyles.authBorder,
                    focusedBorder: AppStyles.authBorder,
                    border: AppStyles.authBorder,
                    fillColor: Colors.transparent,
                    filled: true,
                  ),
                ),
        
                ChipsInputAutocomplete(
                  options: industryValues,
                  createCharacter: ' ',
                  controller: chipController,
                  widgetContainerDecoration: BoxDecoration(
                    border: Border.all(color: Colors.grey),
                    borderRadius: BorderRadius.circular(10),
                  ),
                ),

                TextField(
                  controller: controllers['CompanyName'],
                  decoration: InputDecoration(
                    hintText: "Name of Company",
                    enabledBorder: AppStyles.authBorder,
                    focusedBorder: AppStyles.authBorder,
                    border: AppStyles.authBorder,
                    fillColor: Colors.transparent,
                    filled: true,
                  ),
                ),


              ],
            ),
          ),

`

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Error on Scroll if controller property is set #7

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