feat: add file upload pattern

styles/10-components-interactive-elements.css

@@ -1585,3 +1585,45 @@
       color: var(--text-hyperlink);
       text-decoration: none;
     }
+
+/* Component: File Input */
+.sg-file-input {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-small);
+  width: 100%;
+}
+
+.sg-file-input__control {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+.sg-file-input:focus-within .sg-file-input__trigger {
+  outline: 2px solid var(--text-hyperlink);
+  outline-offset: 2px;
+}
+
+.sg-file-input__description {
+  margin: 0;
+  color: var(--text-control-disabled);
+}
+
+.sg-file-input__trigger {
+  align-self: flex-start;
+}
+
+.sg-file-input--disabled {
+  opacity: var(--disabled-opacity);
+}
+
+.sg-file-input--disabled .sg-file-input__trigger {
+  cursor: not-allowed;
+}