feat: message editing with version history and AI regeneration

src/pages/GamePage.css

@@ -307,10 +307,10 @@
 }
 
 .message.assistant .message-content {
-  background: #1a1a1a;
+  background: transparent;
   color: #e5e5e5;
   border: none;
-  border-bottom-left-radius: 6px;
+  padding: 0.5rem 0;
 }
 
 .message-content p {
@@ -364,19 +364,144 @@
   margin: 0.75rem 0;
 }
 
-.message-time {
-  display: block;
-  font-size: 0.65rem;
-  color: #444;
+.message-footer {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
   margin-top: 0.25rem;
   padding: 0 0.4rem;
 }
 
+.message-time {
+  font-size: 0.65rem;
+  color: #444;
+}
+
 .message.user .message-time {
-  text-align: right;
   color: rgba(255, 255, 255, 0.4);
 }
 
+.message.user .message-footer {
+  flex-direction: row-reverse;
+}
+
+.message-actions {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  opacity: 0;
+  transition: opacity 0.2s;
+}
+
+.message:hover .message-actions {
+  opacity: 1;
+}
+
+.edit-btn {
+  background: none;
+  border: none;
+  font-size: 0.75rem;
+  cursor: pointer;
+  padding: 0.25rem;
+  opacity: 0.6;
+  transition: opacity 0.2s;
+}
+
+.edit-btn:hover {
+  opacity: 1;
+}
+
+.version-switcher {
+  display: flex;
+  align-items: center;
+  gap: 0.25rem;
+  background: rgba(255, 255, 255, 0.1);
+  border-radius: 12px;
+  padding: 0.15rem 0.35rem;
+}
+
+.version-btn {
+  background: none;
+  border: none;
+  color: #888;
+  font-size: 0.9rem;
+  cursor: pointer;
+  padding: 0 0.25rem;
+  line-height: 1;
+  transition: color 0.2s;
+}
+
+.version-btn:hover {
+  color: #fff;
+}
+
+.version-indicator {
+  font-size: 0.7rem;
+  color: #666;
+  min-width: 2rem;
+  text-align: center;
+}
+
+/* Message editing */
+.message-edit-form {
+  width: 100%;
+}
+
+.message-edit-textarea {
+  width: 100%;
+  min-height: 60px;
+  padding: 0.75rem;
+  background: #1a1a1a;
+  border: 1px solid rgba(37, 99, 235, 0.5);
+  border-radius: 12px;
+  color: white;
+  font-size: 0.95rem;
+  font-family: inherit;
+  resize: vertical;
+  line-height: 1.4;
+}
+
+.message-edit-textarea:focus {
+  outline: none;
+  border-color: #2563eb;
+}
+
+.message-edit-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 0.5rem;
+  margin-top: 0.5rem;
+}
+
+.edit-cancel-btn,
+.edit-save-btn {
+  padding: 0.4rem 0.75rem;
+  border: none;
+  border-radius: 8px;
+  font-size: 0.8rem;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.edit-cancel-btn {
+  background: #333;
+  color: #aaa;
+}
+
+.edit-cancel-btn:hover {
+  background: #444;
+  color: #fff;
+}
+
+.edit-save-btn {
+  background: #2563eb;
+  color: white;
+}
+
+.edit-save-btn:hover {
+  background: #1d4ed8;
+}
+
 .message.loading .message-content {
   padding: 1rem;
 }
@@ -664,4 +789,18 @@
     right: 0.75rem;
     font-size: 1rem;
   }
+
+  .message-actions {
+    opacity: 1;
+  }
+
+  .message-edit-textarea {
+    font-size: 0.9rem;
+  }
+
+  .edit-cancel-btn,
+  .edit-save-btn {
+    font-size: 0.75rem;
+    padding: 0.35rem 0.6rem;
+  }
 }