Fix some open file/folder issues

- "Open folder" now says "open folder" instead of "open file"
- "Open folder" won't allow you to open files
- "Open file" won't allow you to open directories

Fixes #249.

packages/vscode/src/dialog.scss

@@ -2,6 +2,7 @@
 	--primary: #2A2E37;
 	--border: black;
 	--faded: #a0a1a5;
+	--disabled: #888;
 	--header-background: #161616;
 	--header-foreground: white;
 	--list-active-selection-background: rgb(0, 120, 160);
@@ -101,6 +102,12 @@
 				background-color: var(--list-active-selection-background);
 				color: var(--list-active-selection-foreground);
 			}
+
+			&.disabled, &.disabled:hover {
+				background-color: var(--primary);
+				color: var(--disabled);
+				cursor: initial;
+			}
 		}
 	}
 
@@ -134,6 +141,11 @@
 				color: white;
 			}
 		}
+
+		button[disabled], button[disabled]:hover {
+			color: var(--disabled);
+			cursor: initial;
+		}
 	}
 }