Improve error handling / roundtrip behavior

Summary:
Slightly improves the support form interactions / code flow:
* When uploading, input fields are hidden
* WHen upload succeeded: Show link to final post
* When upload succeeded: be able to start a new bug report
* Styled error messages, and unified error flow
* Don't support report if errors occurred

Reviewed By: priteshrnandgaonkar

Differential Revision: D18779791

fbshipit-source-id: 28e873d0509865c66d861fe9cedb62a31f0e8bae

src/ui/components/Link.tsx

@@ -25,6 +25,7 @@ StyledLink.displayName = 'Link:StyledLink';
 export default class Link extends Component<{
   href: string;
   children?: React.ReactNode;
+  style?: React.CSSProperties;
 }> {
   onClick = () => {
     shell.openExternal(this.props.href);
@@ -32,7 +33,7 @@ export default class Link extends Component<{
 
   render() {
     return (
-      <StyledLink onClick={this.onClick}>
+      <StyledLink onClick={this.onClick} style={this.props.style}>
         {this.props.children || this.props.href}
       </StyledLink>
     );