Implement static 6-arrow layout with logical grouping system

- Fix dynamic column generation issue that created 6 columns instead of 3
- Implement static 12-row grid with intelligent visual state management
- Add visual-to-logical mapping system for proper end/arrow indexing
- Fix sum calculations using logical end groupings instead of visual rows
- Replace ends per set selector with automatic ruleset inference
- Convert to percentage-based responsive layout eliminating viewport overflow
- Add clean merged arrow header replacing individual column indices

Core improvements:
- 3-arrow (Indoor): 10 ends, sum-3 active, sum-6 on even ends
- 6-arrow (Outdoor): 6 ends, sum-3 greyed, sum-6 every 2 visual rows
- No more RenderFlex overflow errors with responsive column widths
- Proper bounds checking prevents range errors on inactive rows
- Package identifier updated to com.novoyuuparosk.archery_bookkeeper

🤖 Generated with [Claude Code](https://claude.ai/code)

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

lib/presentation/pages/scoring_page.dart

@@ -33,13 +33,8 @@ class _ScoringPageState extends State<ScoringPage> {
   void _onArrowsPerEndChanged(int arrows) {
     setState(() {
       arrowsPerEnd = arrows;
-      _initializeScores();
-    });
-  }
-
-  void _onEndsPerSetChanged(int ends) {
-    setState(() {
-      endsPerSet = ends;
+      // Infer ends per set based on ruleset
+      endsPerSet = arrows == 3 ? 10 : 6;
       _initializeScores();
     });
   }
@@ -90,9 +85,7 @@ class _ScoringPageState extends State<ScoringPage> {
             padding: const EdgeInsets.all(16.0),
             child: ToggleSwitches(
               arrowsPerEnd: arrowsPerEnd,
-              endsPerSet: endsPerSet,
               onArrowsPerEndChanged: _onArrowsPerEndChanged,
-              onEndsPerSetChanged: _onEndsPerSetChanged,
             ),
           ),