feat: cursor navigation, key sounds, dictionary tooling, key security

Batch of in-progress app work from the working tree.

- feat(keyboard): CursorNavigation + CursorDragPad for caret movement;
  KeyboardSoundFeedback for system key click sounds
- feat(dictionary): DictionaryAliasGenerator + PersonalDictionaryEntrySheet;
  TranscriptPostProcessor quality gate; retire DictionaryLearner
- feat(ui): TabBarVisibility handling; drop PageHeaderRow /
  PageHeaderConfirmButton; refresh views and localizable strings
- fix(security): move the hardcoded DeepSeek key out of
  PreconfiguredKeys.swift into a gitignored PreconfiguredKeys.local.swift
  (seeded from .example by generate-xcodeproj.sh)
- docs(agents): add Conventional Commits versioning + bilingual changelog rules
- chore(gitignore): ignore PreconfiguredKeys.local.swift, .cache/, pycache

Custom language model / lexicon work stays on
feature/custom-language-model-asr. Changelog bullets added under
[Unreleased]; no version bump.

project.yml

@@ -36,8 +36,8 @@ settings:
     GENERATE_INFOPLIST_FILE: NO
     ENABLE_MODULE_VERIFIER: YES
     CLANG_CXX_LANGUAGE_STANDARD: c++17
-    MARKETING_VERSION: "0.3.2"
-    CURRENT_PROJECT_VERSION: "7"
+    MARKETING_VERSION: "0.3.6"
+    CURRENT_PROJECT_VERSION: "10"
     # 签名配置来自 Signing.local.xcconfig（gitignored，不会被覆盖）
 
 # 项目级签名 xcconfig，适用于所有 target
@@ -215,6 +215,7 @@ targets:
         excludes:
           - "en.lproj"
           - "zh-Hans.lproj"
+          - "**/*.swift.example"
       - path: OSGKeyboardShared/en.lproj/Shared.strings
         buildPhase: resources
       - path: OSGKeyboardShared/zh-Hans.lproj/Shared.strings