feat: add connection sharing (export/import .tablepro files)

CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Connection sharing: export/import connections as `.tablepro` files (#466)
+- Import preview with duplicate detection, warning badges, and per-item resolution
+- "Copy as Import Link" context menu action for sharing via `tablepro://` URLs
+- `.tablepro` file type registration (double-click to import, drag-and-drop)
+
 ## [0.24.2] - 2026-03-26
 
 ### Fixed

TablePro/AppDelegate+FileOpen.swift

@@ -78,6 +78,12 @@ extension AppDelegate {
             }
         }
 
+        // Connection share files
+        let connectionShareFiles = urls.filter { $0.pathExtension.lowercased() == "tablepro" }
+        for url in connectionShareFiles {
+            handleConnectionShareFile(url)
+        }
+
         let sqlFiles = urls.filter { $0.pathExtension.lowercased() == "sql" }
         if !sqlFiles.isEmpty {
             if DatabaseManager.shared.currentSession != nil {
@@ -200,6 +206,16 @@ extension AppDelegate {
         }
     }
 
+    // MARK: - Connection Share Import
+
+    private func handleConnectionShareFile(_ url: URL) {
+        openWelcomeWindow()
+        // Delay to ensure WelcomeWindowView's .onReceive is registered after window renders
+        DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
+            NotificationCenter.default.post(name: .connectionShareFileOpened, object: url)
+        }
+    }
+
     // MARK: - Plugin Install
 
     private func handlePluginInstall(_ url: URL) async {