Adopt codicon tree item label for current issue in issues view (#8134)

* Initial plan

* Adopt codicon tree item label for current issue in issues view

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

* Add escaping for special characters in issue titles

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

src/issues/issuesView.ts

@@ -117,7 +117,12 @@ export class IssuesTreeData
 		};
 
 		if (this.stateManager.currentIssue(element.uri)?.issue.number === element.number) {
-			treeItem.label = `✓ ${treeItem.label as string}`;
+			// Escape any $(...) syntax to avoid rendering issue titles as icons.
+			const escapedTitle = element.title.replace(/\$\([a-zA-Z0-9~-]+\)/g, '\\$&');
+			const label: vscode.TreeItemLabel2 = {
+				label: new vscode.MarkdownString(`$(check) ${escapedTitle}`, true)
+			};
+			treeItem.label = label as vscode.TreeItemLabel;
 			treeItem.contextValue = 'currentissue';
 		} else {
 			const savedState = this.stateManager.getSavedIssueState(element.number);