feat: Add statistics tracking and fix clipboard API

- Add personal statistics with badges for each attempt count
- Track solved puzzles per attempt (1-6) and failed attempts
- Display statistics after game completion
- Fix clipboard API issue with fallback method
- Add footer with attribution

app/globals.css

@@ -6,12 +6,9 @@
 
 body {
   color: rgb(var(--foreground-rgb));
-  background: linear-gradient(
-      to bottom,
+  background: linear-gradient(to bottom,
       transparent,
-      rgb(var(--background-end-rgb))
-    )
-    rgb(var(--background-start-rgb));
+      rgb(var(--background-end-rgb))) rgb(var(--background-start-rgb));
   font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
     Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
   margin: 0;
@@ -63,7 +60,7 @@ body {
   background: #f3f4f6;
   padding: 1rem;
   border-radius: 0.5rem;
-  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
 }
 
 .player-controls {
@@ -128,7 +125,8 @@ body {
 }
 
 .guess-text {
-  color: #ef4444; /* Red for wrong */
+  color: #ef4444;
+  /* Red for wrong */
 }
 
 .guess-text.skipped {
@@ -272,3 +270,84 @@ body {
 .btn-primary:hover {
   background: #333;
 }
+
+/* Footer */
+.app-footer {
+  margin-top: auto;
+  padding: 2rem 1rem 1rem;
+  text-align: center;
+  font-size: 0.875rem;
+  color: #666;
+  border-top: 1px solid #e5e7eb;
+  width: 100%;
+}
+
+.app-footer p {
+  margin: 0;
+}
+
+.app-footer a {
+  color: #000;
+  text-decoration: none;
+  font-weight: 500;
+}
+
+.app-footer a:hover {
+  text-decoration: underline;
+}
+
+/* Statistics */
+.statistics-container {
+  margin: 1.5rem 0;
+  padding: 1rem;
+  background: rgba(255, 255, 255, 0.5);
+  border-radius: 0.5rem;
+}
+
+.statistics-title {
+  font-size: 1.125rem;
+  font-weight: bold;
+  margin: 0 0 0.5rem 0;
+  text-align: center;
+}
+
+.statistics-total {
+  font-size: 0.875rem;
+  text-align: center;
+  margin: 0 0 1rem 0;
+  color: #666;
+}
+
+.statistics-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
+  gap: 0.75rem;
+}
+
+.stat-item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 0.75rem 0.5rem;
+  background: rgba(255, 255, 255, 0.8);
+  border-radius: 0.375rem;
+  border: 1px solid #e5e7eb;
+}
+
+.stat-badge {
+  font-size: 1.5rem;
+  margin-bottom: 0.25rem;
+}
+
+.stat-label {
+  font-size: 0.75rem;
+  color: #666;
+  margin-bottom: 0.25rem;
+  text-align: center;
+}
+
+.stat-count {
+  font-size: 1.25rem;
+  font-weight: bold;
+  color: #000;
+}