feat(app): add query file open & save workflow and top-level tab drag/drop support

README.md

@@ -1,5 +1,20 @@
 # Performance Studio
 
+## Fork Notice
+
+This repository is a personal fork of Erik Darling's PerformanceStudio project, maintained to support additional workflow and UX changes for day-to-day tuning work.
+
+Current fork-specific changes include:
+- query file save and save-as actions in the desktop app
+- top-level tab drag/drop behavior and related UI improvements
+- iterative app-level settings and session handling updates tied to those features
+
+Upstream source of truth: [erikdarlingdata/PerformanceStudio](https://github.com/erikdarlingdata/PerformanceStudio)
+
+If you do not specifically need the fork changes above, prefer the upstream repository for official releases and updates.
+
+---
+
 A cross-platform SQL Server execution plan analyzer with built-in MCP server for AI-assisted analysis. Parses `.sqlplan` XML, identifies performance problems, suggests missing indexes, and provides actionable warnings — from the command line or a desktop GUI.
 
 Built for developers and DBAs who want fast, automated plan analysis without clicking through SSMS.

src/PlanViewer.App/Controls/QuerySessionControl.axaml.cs

@@ -44,14 +44,22 @@ public partial class QuerySessionControl : UserControl
     private CancellationTokenSource? _statusClearCts;
     private CompletionWindow? _completionWindow;
 
+    public string QueryText
+    {
+        get => QueryEditor.Text ?? "";
+        set => QueryEditor.Text = value ?? "";
+    }
+
+    public string? SourceFilePath { get; set; }
+
     public QuerySessionControl(ICredentialService credentialService, ConnectionStore connectionStore)
     {
         _credentialService = credentialService;
         _connectionStore = connectionStore;
         InitializeComponent();
 
         // Initialize editor with empty text so the document is ready
-        QueryEditor.Text = "";
+        QueryText = "";
         ZoomBox.SelectedIndex = 2; // 100%
 
         SetupSyntaxHighlighting();

src/PlanViewer.App/MainWindow.axaml

@@ -16,8 +16,12 @@
             <MenuItem Header="_File">
                 <MenuItem Header="New _Query" Click="NewQuery_Click"
                           InputGesture="Ctrl+N"/>
-                <MenuItem Header="_Open .sqlplan..." Click="OpenFile_Click"
+                <MenuItem Header="_Open File..." Click="OpenFile_Click"
                           InputGesture="Ctrl+O"/>
+                <MenuItem x:Name="SaveQueryMenuItem" Header="_Save Query" Click="SaveQuery_Click"
+                          InputGesture="Ctrl+S" IsEnabled="False"/>
+                <MenuItem x:Name="SaveAsQueryMenuItem" Header="Save Query _As..." Click="SaveAsQuery_Click"
+                          InputGesture="Ctrl+Shift+S" IsEnabled="False"/>
                 <MenuItem Header="_Paste Plan XML" Click="PasteXml_Click"
                           InputGesture="Ctrl+V"/>
                 <Separator/>