feat: add 7th guess with 60s unlock and update docs

lib/gameState.ts

@@ -17,6 +17,7 @@ export interface Statistics {
     solvedIn4: number;
     solvedIn5: number;
     solvedIn6: number;
+    solvedIn7: number;
     failed: number;
 }
 
@@ -64,7 +65,12 @@ export function useGameState() {
         // Load statistics
         const storedStats = localStorage.getItem(STATS_KEY);
         if (storedStats) {
-            setStatistics(JSON.parse(storedStats));
+            const parsedStats = JSON.parse(storedStats);
+            // Migration for existing stats without solvedIn7
+            if (parsedStats.solvedIn7 === undefined) {
+                parsedStats.solvedIn7 = 0;
+            }
+            setStatistics(parsedStats);
         } else {
             const newStats: Statistics = {
                 solvedIn1: 0,
@@ -73,6 +79,7 @@ export function useGameState() {
                 solvedIn4: 0,
                 solvedIn5: 0,
                 solvedIn6: 0,
+                solvedIn7: 0,
                 failed: 0,
             };
             setStatistics(newStats);
@@ -98,6 +105,7 @@ export function useGameState() {
                 case 4: newStats.solvedIn4++; break;
                 case 5: newStats.solvedIn5++; break;
                 case 6: newStats.solvedIn6++; break;
+                case 7: newStats.solvedIn7++; break;
             }
         } else {
             newStats.failed++;
@@ -112,7 +120,7 @@ export function useGameState() {
 
         const newGuesses = [...gameState.guesses, guess];
         const isSolved = correct;
-        const isFailed = !correct && newGuesses.length >= 6;
+        const isFailed = !correct && newGuesses.length >= 7;
 
         const newState = {
             ...gameState,