feat: ⌘Y / ⌘P shortcuts for history and pin on the translate window

CHANGELOG.md

@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Keyboard-first translation window: ⌘1 / ⌘2 / ⌘3 switch between Translate,
   Polish, and Summary, and ⌘R regenerates the current result. Each mode segment
   shows its shortcut hint.
+- ⌘Y opens the translation history and ⌘P pins/unpins the window, matching the
+  toolbar buttons; both shortcuts are shown in the buttons' tooltips.
 - Markdown tables in results now render as a bordered grid instead of raw
   `| --- |` pipe-and-dash text. All other output stays as plain, selectable,
   copyable text.

mac-app/Lumo/Localizable.xcstrings

@@ -231,12 +231,12 @@
         }
       }
     },
-    "Pin window" : {
+    "Pin window (⌘P)" : {
       "localizations" : {
         "zh-Hans" : {
           "stringUnit" : {
             "state" : "translated",
-            "value" : "置顶窗口"
+            "value" : "置顶窗口（⌘P）"
           }
         }
       }
@@ -511,6 +511,16 @@
         }
       }
     },
+    "Translation History (⌘Y)" : {
+      "localizations" : {
+        "zh-Hans" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "翻译历史（⌘Y）"
+          }
+        }
+      }
+    },
     "Translation History…" : {
       "localizations" : {
         "zh-Hans" : {
@@ -521,6 +531,16 @@
         }
       }
     },
+    "Unpin window (⌘P)" : {
+      "localizations" : {
+        "zh-Hans" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "取消置顶（⌘P）"
+          }
+        }
+      }
+    },
     "View on GitHub" : {
       "localizations" : {
         "zh-Hans" : {

mac-app/Lumo/Views/TranslationView.swift

@@ -125,12 +125,17 @@ struct TranslationView: View {
             Button { HistoryWindowController.shared.toggle() } label: {
                 Image(systemName: "clock.arrow.circlepath")
             }
-            .help("Translation History")
+            // ⌘Y is the de-facto macOS history shortcut (Safari, Finder). Like
+            // the Run button, this visible control carries its shortcut directly
+            // and still fires while the TextEditor holds focus.
+            .keyboardShortcut("y", modifiers: .command)
+            .help("Translation History (⌘Y)")
 
             Button { model.togglePin() } label: {
                 Image(systemName: model.isPinned ? "pin.fill" : "pin")
             }
-            .help("Pin window")
+            .keyboardShortcut("p", modifiers: .command)
+            .help(model.isPinned ? "Unpin window (⌘P)" : "Pin window (⌘P)")
 
             Button { model.dismiss() } label: {
                 Image(systemName: "xmark")