Duplicate Code: Identical EmptyCard and InitialCard Widgets

## Summary

The `EmptyCard` and `InitialCard` widgets are functionally identical - both render empty centered columns with the same implementation. This is a 100% code duplication that should be consolidated into a single reusable component.

## Duplication Details

### Pattern: Identical Widget Implementations
- **Severity**: High
- **Occurrences**: 2 instances
- **Locations**:
- `lib/ui/widgets/empty_card.dart:3-17`
- `lib/ui/widgets/initial_card.dart:3-17`

**Code Sample:**

``````dart
// empty_card.dart
class EmptyCard extends StatelessWidget {
const EmptyCard({
Key? key,
}) : super(key: key);

`@override`
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: const [],
),
);
}
}

// initial_card.dart - IDENTICAL except class name
class InitialCard extends StatelessWidget {
const InitialCard({
Key? key,
}) : super(key: key);

`@override`
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: const [],
),
);
}
}
``````

## Impact Analysis

- **Maintainability**: Any changes to the empty state UI must be duplicated across both files, increasing the risk of inconsistencies
- **Bug Risk**: If one widget is updated but not the other, the app will have inconsistent empty state behavior
- **Code Bloat**: 17 lines of unnecessary duplicate code

## Refactoring Recommendations

### Option 1: Single Widget with Type Parameter (Recommended)
Extract to a single `PlaceholderCard` widget with a parameter to distinguish between states:

``````dart
class PlaceholderCard extends StatelessWidget {
final PlaceholderType type;

const PlaceholderCard({
Key? key,
this.type = PlaceholderType.empty,
}) : super(key: key);

`@override`
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: const [],
),
);
}
}

enum PlaceholderType { empty, initial }
``````

### Option 2: Named Constructors
Use a single widget with named constructors:

``````dart
class PlaceholderCard extends StatelessWidget {
const PlaceholderCard({Key? key}) : super(key: key);

const PlaceholderCard.empty({Key? key}) : super(key: key);
const PlaceholderCard.initial({Key? key}) : super(key: key);

`@override`
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: const [],
),
);
}
}
``````

### Option 3: Type Aliases
If the widgets truly need to remain separate for semantic reasons, use type aliases:

``````dart
typedef EmptyCard = PlaceholderCard;
typedef InitialCard = PlaceholderCard;
``````

## Implementation Checklist

- [ ] Review current usage of `EmptyCard` and `InitialCard` to determine if they need different behavior
- [ ] Choose refactoring approach (Option 1 recommended)
- [ ] Create unified `PlaceholderCard` widget
- [ ] Update all references to `EmptyCard` and `InitialCard`
- [ ] Remove duplicate widget files
- [ ] Update widget exports in `lib/ui/widgets/widgets.dart`
- [ ] Run tests to verify no functionality broken

## Analysis Metadata

- **Analyzed Files**: 25 Dart files
- **Detection Method**: Semantic code analysis
- **Commit**: eaf30ea
- **Analysis Date**: 2026-02-18
- **Duplication Size**: 17 lines (100% match)

> AI generated by [Duplicate Code Detector](https://github.com/chimon2000/good_first_issue/actions/runs/22138908565)
>
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