Optimize simulation with logic-only solver, fix rectangular grid support, and improve worker pool

src/utils/large_grid_solver.test.js

@@ -0,0 +1,44 @@
+
+import { describe, it, expect } from 'vitest';
+import { solvePuzzle } from './solver.js';
+
+describe('Large Grid Solver', () => {
+    it('should solve a large 55x28 grid without crashing', () => {
+        const rows = 28;
+        const cols = 55;
+        // Create a simple pattern: checkerboard or lines
+        const grid = Array(rows).fill().map((_, r) => 
+            Array(cols).fill().map((_, c) => (r + c) % 2 === 0 ? 1 : 0)
+        );
+        
+        // Calculate hints
+        const rowHints = grid.map(row => {
+            const hints = [];
+            let current = 0;
+            row.forEach(cell => {
+                if (cell === 1) current++;
+                else if (current > 0) { hints.push(current); current = 0; }
+            });
+            if (current > 0) hints.push(current);
+            return hints.length ? hints : [0];
+        });
+        
+        const colHints = Array(cols).fill().map((_, c) => {
+            const hints = [];
+            let current = 0;
+            for(let r=0; r<rows; r++) {
+                if (grid[r][c] === 1) current++;
+                else if (current > 0) { hints.push(current); current = 0; }
+            }
+            if (current > 0) hints.push(current);
+            return hints.length ? hints : [0];
+        });
+        
+        console.log('Starting solve...');
+        const result = solvePuzzle(rowHints, colHints, (p) => console.log(`Progress: ${p}%`));
+        console.log('Result:', result);
+        
+        expect(result.percentSolved).toBeGreaterThan(0);
+        expect(result.difficulty).toBeDefined();
+    });
+});