Adds a toolbar button to launch VS Code with the MSBuild Binlog Analyzer
extension (dotutils.binlog-analyzer) for Copilot-powered build analysis.

Features:
- 'Open in VS Code' button in toolbar with tip bar hint
- Attach binlog button for multi-binlog comparison
- Auto-installs extension from VS Code Marketplace if not present
- Detects workspace folder from binlog project paths
- Cross-machine binlog support (defers to VS Code extension)
- Writes .vscode/settings.json and .vscode/mcp.json for MCP tools

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Copilot <[email protected]>

Restores the original SetProjectContext behavior:
- contents ??= 'A project or evaluation must be selected.' fallback
- projectContextBorder always Visibility.Visible
- projectContextLabel.Visibility controlled by contents != null
- Guard condition order matching main

Co-authored-by: Copilot <[email protected]>

Reverts accidental modifications to existing code:
- Restore DisplayTarget evaluation parameter and call sites
- Restore EditorExtension unconditional creation with Evaluation property
- Restore PreprocessContext != null check
- Restore 'View project graph' button in folder children
- Move ViewProperty and SearchForProperty back to original locations
- Fix formatting (blank line, indentation)

The diff is now purely additive — only new VS Code feature code.

Co-authored-by: Copilot <[email protected]>

Add 'Open in VS Code' button with binlog analyzer extension