fix: preserve uncommitted translation input

Tests/ConjureKitTests/TranslationExecutionTests.swift

@@ -1,4 +1,5 @@
 import AppKit
+import ConjureKit
 import Foundation
 import Testing
 @testable import Conjure
@@ -146,11 +147,14 @@ func primaryActionCopiesCompletedTranslationAndResetsAfterEditing() async throws
     #expect(!dismissed)
     requests.pending[0].resume(returning: "こんにちは")
     try await waitForTranslation { button.isEnabled }
+    #expect(tool.draft?.input == "Hello")
     tool.performPrimaryAction()
     #expect(pasteboard.string(forType: .string) == "こんにちは")
     #expect(dismissed)
+    #expect(tool.draft == nil)
     dismissed = false
     tool.inputChanged()
+    #expect(tool.draft?.input == "Hello")
     button.performClick(nil)
     try await waitForTranslation { requests.pending.count == 2 }
     #expect(!dismissed)
@@ -435,4 +439,73 @@ func blankContextTranslatesWithoutSwappingAndProviderChangesRestoreOriginalText(
     requests.pending[2].resume(returning: "やあ")
     try await waitForTranslation { output.string == "やあ" }
 }
+
+@Test(arguments: ["escape", "window-close", "deactivate", "switch"])
+@MainActor func uncommittedInputSurvivesLeavingTranslate(_ exit: String) throws {
+    _ = NSApplication.shared
+    let suite = "TranslateDraft.\(UUID().uuidString)"
+    let defaults = UserDefaults(suiteName: suite)!
+    defaults.set("openai", forKey: "translationProvider")
+    defer { defaults.removePersistentDomain(forName: suite) }
+    let launcher = LauncherWindowController(
+        history: LaunchHistory(defaults: defaults, now: { Date(timeIntervalSinceReferenceDate: 12_000) }),
+        defaults: defaults)
+    let window = try #require(launcher.window)
+    defer { window.orderOut(nil) }
+    let content = try #require(window.contentView)
+    let search = try #require(descendants(content).compactMap { $0 as? NSSearchField }.first)
+    func tool() throws -> TranslationController {
+        try #require(descendants(content).compactMap { $0 as? NSButton }
+            .compactMap { $0.target as? TranslationController }.first)
+    }
+    func enter(_ text: String) {
+        search.stringValue = text
+        launcher.controlTextDidChange(Notification(name: NSControl.textDidChangeNotification, object: search))
+    }
+    func leave() {
+        switch exit {
+        case "escape":
+            _ = launcher.control(search, textView: NSTextView(), doCommandBy: #selector(NSResponder.cancelOperation(_:)))
+        case "window-close":
+            window.performClose(nil)
+        case "deactivate":
+            launcher.windowDidResignKey(Notification(name: NSWindow.didResignKeyNotification, object: window))
+        default:
+            launcher.present(command: .emoji)
+        }
+    }
+    launcher.present(command: .translate)
+    enter("  An unfinished sentence 🌏\n")
+    leave()
+    launcher.present(command: .translate)
+    #expect(search.stringValue == "  An unfinished sentence 🌏\n")
+    #expect(search.accessibilityLabel() == "English text to translate into Japanese")
+
+    try tool().performPrimaryAction() // Advance to context without sending a request.
+    leave()
+    launcher.present(command: .translate)
+    #expect(search.stringValue.isEmpty)
+    #expect(search.accessibilityLabel() == "Context or situation for the translation (optional)")
+    enter("Said by a friend")
+    leave()
+    launcher.present(command: .translate)
+    #expect(search.stringValue == "Said by a friend")
+    #expect(search.accessibilityLabel() == "Context or situation for the translation (optional)")
+    let preview = try #require(descendants(content).compactMap { $0 as? NSTextField }
+        .first { $0.accessibilityLabel() == "Original text to translate" })
+    #expect(preview.stringValue == "Text to translate:   An unfinished sentence 🌏\n")
+    try tool().goBack()
+    #expect(search.stringValue == "  An unfinished sentence 🌏\n")
+    try tool().goBack() // Returning to Applications must also retain the draft.
+    search.stringValue = "translate"
+    launcher.controlTextDidChange(Notification(name: NSControl.textDidChangeNotification, object: search))
+    _ = launcher.control(search, textView: NSTextView(), doCommandBy: #selector(NSResponder.insertNewline(_:)))
+    #expect(search.stringValue == "  An unfinished sentence 🌏\n")
+
+    enter("")
+    leave()
+    launcher.present(command: .translate)
+    #expect(search.stringValue.isEmpty) // Clearing a draft must not resurrect older text.
+    launcher.dismiss()
+}
 }