Duplicate Code: URL Launching Logic in AboutPage and LinkService

## Summary

Duplicate URL launching logic exists in both `AboutPage` and `LinkService` with inconsistent implementations. The AboutPage directly uses url_launcher APIs while LinkService wraps them, creating maintenance burden and inconsistency.

## Duplication Details

### Pattern: URL Launching with Capability Check
- **Severity**: Medium
- **Occurrences**: 2 instances
- **Locations**:
- `lib/ui/pages/about.dart` (lines 77-80)
- `lib/services/link.dart` (lines 7-11)

- **Code Samples**:

**AboutPage implementation:**
``````dart
if (await canLaunchUrl(Uri.parse(url!))) {
await launchUrl(Uri.parse(url));
} else {
throw 'Could not launch $url';
}
``````

**LinkService implementation:**
``````dart
if (await canLaunchUrlString(link)) {
await launchUrlString(link);
} else {
throw 'Could not launch $link';
}
``````

## Impact Analysis

- **Maintainability**: Updates to URL launching behavior must be made in multiple places
- **Bug Risk**: Different implementations (Uri.parse vs string) can lead to inconsistent behavior
- **Code Bloat**: Unnecessary duplication of error handling logic
- **Inconsistency**: AboutPage bypasses the LinkService abstraction that other pages use

## Refactoring Recommendations

1. **Consolidate URL launching through LinkService**
- Update AboutPage to use `ref.read(linkServiceProvider).launchLink(url)` instead of direct url_launcher calls
- Estimated effort: 15 minutes
- Benefits: Single source of truth for URL launching, consistent error handling, easier testing

2. **Consider adding a launchUri method to LinkService**
- Add method that accepts Uri objects if needed
- Benefits: Flexibility while maintaining centralized logic

## Implementation Checklist

- [ ] Review duplication findings
- [ ] Update AboutPage to use LinkService for URL launching (lines 77-80)
- [ ] Remove direct url_launcher imports from AboutPage
- [ ] Update tests to verify LinkService integration
- [ ] Verify all URL launching works correctly

## Analysis Metadata

- **Analyzed Files**: 33
- **Detection Method**: Pattern matching and semantic analysis
- **Commit**: eaf30eabe62f9b178466629c6d3a4c4390e17311
- **Analysis Date**: 2026-02-24

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Start with lib/ui/pages/about.dart lines 77-80 and lib/services/link.dart lines 7-11, then inspect the existing LinkService provider and related tests. Route AboutPage URL launching through LinkService, remove the direct url_launcher imports, add or update integration coverage, and verify URL launching still works correctly.

Written by the indexing model from the issue text.