style: Disable text selection globally with selective text input exceptions

src/renderer/src/assets/styles/index.scss

@@ -70,6 +70,13 @@
   --list-item-border-radius: 16px;
 }
 
+body {
+  -webkit-user-select: none;
+  -moz-user-select: none;
+  -ms-user-select: none;
+  user-select: none;
+}
+
 body[theme-mode='light'] {
   --color-white: #ffffff;
   --color-white-soft: #f2f2f2;
@@ -160,6 +167,19 @@ body {
   transition: background-color 0.3s linear;
 }
 
+input,
+textarea,
+[contenteditable='true'],
+.markdown,
+.selectable,
+pre,
+code {
+  -webkit-user-select: text !important;
+  -moz-user-select: text !important;
+  -ms-user-select: text !important;
+  user-select: text !important;
+}
+
 a {
   -webkit-user-drag: none;
 }