fix: remove all @Environment(AppState) declarations and injection

- Remove 4 unused @Environment(AppState.self) declarations
- Remove .environment(AppState.shared) injection from WindowGroup
- Add hasQueryText to ConnectionToolbarState
- QueryEditorView derives hasQueryText from queryText binding directly
- Zero appState reads remain; 53 dead writes remain (harmless, for cleanup)

Author: datlechin

TablePro/ContentView.swift

@@ -31,7 +31,6 @@ struct ContentView: View {
     @State private var windowTitle: String
     @Environment(\.openWindow)
     private var openWindow
-    @Environment(AppState.self) private var appState
 
     private let storage = ConnectionStorage.shared
 

TablePro/TableProApp.swift

@@ -512,7 +512,6 @@ struct TableProApp: App {
         // Each native window-tab gets its own ContentView with independent state.
         WindowGroup(id: "main", for: EditorTabPayload.self) { $payload in
             ContentView(payload: payload)
-                .environment(AppState.shared)
                 .background(OpenWindowHandler())
         }
         .windowStyle(.automatic)

TablePro/Views/Editor/QueryEditorView.swift

@@ -14,7 +14,6 @@ import TableProPluginKit
 struct QueryEditorView: View {
     private static let logger = Logger(subsystem: "com.TablePro", category: "QueryEditorView")
 
-    @Environment(AppState.self) private var appState
 
     @Binding var queryText: String
     @Binding var cursorPositions: [CursorPosition]

TablePro/Views/Main/Child/MainEditorContentView.swift

@@ -77,7 +77,6 @@ struct MainEditorContentView: View {
 
     // MARK: - Environment
 
-    @Environment(AppState.self) private var appState
 
     /// Returns the cached AnyChangeManager, creating it on first access.
     private var currentChangeManager: AnyChangeManager {

TablePro/Views/Main/MainContentView.swift

@@ -61,7 +61,6 @@ struct MainContentView: View {
 
     // MARK: - Environment
 
-    @Environment(AppState.self) private var appState
 
     // MARK: - Initialization