merge: bring pinyin habit ranking into English keyboard branch

Keep English QuickType/mmap and Chinese schema hygiene on one branch.
Secure fields skip Rime; English still loads its lexicon only while English is active.

OSGKeyboard/Services/RimeDeploymentController.swift

@@ -90,4 +90,31 @@ final class RimeDeploymentController: ObservableObject {
             }
         }
     }
+
+    /// Wipes implicit typing habits under the same hostHeavy gate as deploy,
+    /// so the keyboard extension cannot keep LevelDB open while files vanish.
+    func clearTypingHabits() {
+        guard activeTask == nil else { return }
+
+        OSGDiag.log("typing.habits.clear begin \(OSGDiag.memoryTag())", category: "flow")
+        status = .deploying
+        activeTask = Task { @MainActor in
+            defer { activeTask = nil }
+            FlowSessionBridge.setHostHeavy(true)
+            do {
+                try await TypingHabitStore.clearAll()
+                FlowSessionBridge.setHostHeavy(false)
+                AppGroupConfigDarwin.postConfigChanged()
+                status = RimeResourceInstaller.isReady ? .ready : .idle
+                OSGDiag.log("typing.habits.clear done \(OSGDiag.memoryTag())", category: "flow")
+            } catch {
+                FlowSessionBridge.setHostHeavy(false)
+                status = .failed(error.localizedDescription)
+                OSGDiag.log(
+                    "typing.habits.clear failed error=\(error.localizedDescription)",
+                    category: "flow"
+                )
+            }
+        }
+    }
 }

OSGKeyboard/Views/TypingInputSettingsView.swift

@@ -12,6 +12,7 @@ struct TypingInputSettingsView: View {
     @ObservedObject private var config = ProviderConfig.shared
     @ObservedObject private var configuration = TypingInputConfiguration.shared
     @ObservedObject private var deployment = RimeDeploymentController.shared
+    @State private var showClearHabitsConfirmation = false
 
     private var isDeploying: Bool { deployment.isDeploying }
 
@@ -69,11 +70,36 @@ struct TypingInputSettingsView: View {
                 }
                 .disabled(isDeploying)
             }
+
+            Section {
+                Button(AppL10n.string("settings.typingInput.habits.clear", language: config.uiLanguage)) {
+                    showClearHabitsConfirmation = true
+                }
+                .disabled(isDeploying)
+                .foregroundStyle(palette.danger)
+            } footer: {
+                Text(AppL10n.string("settings.typingInput.habits.footer", language: config.uiLanguage))
+            }
         }
         .scrollContentBackground(.hidden)
         .background(palette.background)
         .navigationTitle(AppL10n.string("settings.typingInput.title", language: config.uiLanguage))
         .navigationBarTitleDisplayMode(.inline)
+        .confirmationDialog(
+            AppL10n.string("settings.typingInput.habits.clear.title", language: config.uiLanguage),
+            isPresented: $showClearHabitsConfirmation,
+            titleVisibility: .visible
+        ) {
+            Button(
+                AppL10n.string("settings.typingInput.habits.clear.confirm", language: config.uiLanguage),
+                role: .destructive
+            ) {
+                deployment.clearTypingHabits()
+            }
+            Button(AppL10n.string("common.cancel", language: config.uiLanguage), role: .cancel) {}
+        } message: {
+            Text(AppL10n.string("settings.typingInput.habits.clear.message", language: config.uiLanguage))
+        }
     }
 
     private var hasDeploymentError: Bool {

OSGKeyboard/en.lproj/Localizable.strings

@@ -238,6 +238,11 @@
 "settings.typingInput.resources.ready" = "Ready";
 "settings.typingInput.resources.pending" = "Not initialized";
 "settings.typingInput.resources.redeploy" = "Redeploy Input Resources";
+"settings.typingInput.habits.clear" = "Clear Typing Habits";
+"settings.typingInput.habits.clear.title" = "Clear Typing Habits?";
+"settings.typingInput.habits.clear.confirm" = "Clear";
+"settings.typingInput.habits.clear.message" = "Resets learned word order for Chinese and English. Personal dictionary entries are kept.";
+"settings.typingInput.habits.footer" = "Learned frequency only. Words you added to the personal dictionary stay.";
 "settings.speechRecognition.title" = "Speech Recognition";
 "settings.textPolish.title" = "Text Polish";
 "settings.preferences.title" = "Preferences";

OSGKeyboard/zh-Hans.lproj/Localizable.strings

@@ -238,6 +238,11 @@
 "settings.typingInput.resources.ready" = "已就绪";
 "settings.typingInput.resources.pending" = "待初始化";
 "settings.typingInput.resources.redeploy" = "重新部署输入法资源";
+"settings.typingInput.habits.clear" = "清除打字习惯";
+"settings.typingInput.habits.clear.title" = "清除打字习惯？";
+"settings.typingInput.habits.clear.confirm" = "清除";
+"settings.typingInput.habits.clear.message" = "将重置中文和英文的学习词序。个性词库中的词条会保留。";
+"settings.typingInput.habits.footer" = "只清除使用频度。你手动加入个性词库的词不会受影响。";
 "settings.speechRecognition.title" = "语音识别";
 "settings.textPolish.title" = "文本润色";
 "settings.preferences.title" = "偏好设置";