improve layout of the prompt attachment (#239514)

* [ui]: improve layout of the prompt attachment

* [ui]: remove redundant outline style for monaco button

* [ui]: remove redundant CSS styles

src/vs/workbench/contrib/chat/browser/attachments/instructionsAttachment/instructionsAttachment.ts

@@ -148,7 +148,15 @@ export class InstructionsAttachmentWidget extends Disposable {
 		this._register(this.hoverService.setupManagedHover(getDefaultHoverDelegate('element'), hintElement, title));
 
 		// create the `remove` button
-		const removeButton = this.renderDisposables.add(new Button(this.domNode, { supportIcons: true, title: localize('remove', "Remove") }));
+		const removeButton = this.renderDisposables.add(
+			new Button(
+				this.domNode,
+				{
+					supportIcons: true,
+					title: localize('remove', "Remove"),
+				},
+			),
+		);
 		removeButton.icon = Codicon.x;
 		this.renderDisposables.add(removeButton.onDidClick((e) => {
 			e.stopPropagation();

src/vs/workbench/contrib/chat/browser/media/chat.css

@@ -968,6 +968,7 @@ have to be updated for changes to the rules above, or to support more deeply nes
 .chat-attached-context .chat-prompt-instructions-attachment .chat-implicit-hint {
 	opacity: 0.7;
 	font-size: .9em;
+	margin-top: -0.5px;
 }
 .chat-attached-context .chat-prompt-instructions-attachment.warning {
 	color: var(--vscode-notificationsWarningIcon-foreground);
@@ -979,6 +980,20 @@ have to be updated for changes to the rules above, or to support more deeply nes
 	border-style: dashed;
 	opacity: 0.75;
 }
+.chat-attached-context .chat-prompt-instructions-attachment .monaco-button {
+	border-left: 1px solid var(--vscode-chat-requestBorder, var(--vscode-input-background, transparent));
+	margin-left: 3px;
+}
+.chat-attached-context .chat-prompt-instructions-attachment.error .monaco-button,
+.chat-attached-context .chat-prompt-instructions-attachment.warning .monaco-button {
+	border-left-color: currentColor;
+}
+.chat-attached-context .chat-prompt-instructions-attachment:focus .monaco-button {
+	border-color: var(--vscode-focusBorder);
+}
+.chat-attached-context .chat-prompt-instructions-attachment .monaco-icon-label-container {
+	margin-top: -0.1em;
+}
 /*
  * This overly-specific CSS selector is needed to beat priority of some
  * styles applied on the the `.chat-attached-context-attachment` element.
@@ -987,6 +1002,10 @@ have to be updated for changes to the rules above, or to support more deeply nes
 .chat-attached-context .chat-prompt-instructions-attachments .chat-prompt-instructions-attachment.warning.implicit {
 	border: 1px solid currentColor;
 }
+.chat-attached-context .chat-prompt-instructions-attachments .chat-prompt-instructions-attachment.implicit .monaco-button {
+	padding-left: 2px;
+	padding-right: 2px;
+}
 /*
  * If in one of the non-normal states, make sure the `main icon` of
  * the component has the same color as the component itself