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.

CHANGELOG.md

@@ -8,10 +8,39 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
-- **Polish scenarios**: pick a writing context (Daily Chat, Social Network / 小红书, Instagram / 微博, Goofy, Work, Document, TODO, Custom) in Settings, onboarding, and the keyboard top-bar `ScenarioChip`. Presets drive `ScenarioPrompt`; Custom reuses the system prompt editor.
+- **Cursor navigation**: keyboard drag pad (`CursorDragPad` / `CursorNavigation`) for precise caret movement. / **光标导航**：键盘拖动手势区（`CursorDragPad` / `CursorNavigation`），精确移动光标。
+- **Key sound feedback**: `KeyboardSoundFeedback` plays system key clicks on input. / **按键音反馈**：`KeyboardSoundFeedback` 在输入时播放系统按键音。
+- **Personal dictionary tooling**: `DictionaryAliasGenerator` and `PersonalDictionaryEntrySheet` for managing custom terms and aliases. / **个人词库工具**：`DictionaryAliasGenerator` 与 `PersonalDictionaryEntrySheet`，用于管理自定义词条与别名。
+- **Transcript post-processing**: `TranscriptPostProcessor` quality gate on the shared ASR path. / **转写后处理**：共享 ASR 链路上的 `TranscriptPostProcessor` 质量校验。
 
 ### Changed
-- **Scenario output formats**: shared `ScenarioStyleDirective` enforces structural rules (Work → mandatory bullets for multi-item input, TODO → checklist). The same directive applies to translate-and-polish via `TranslationPrompt`.
+- **Tab bar visibility**: `TabBarVisibility` centralizes show/hide handling; retired `PageHeaderRow` / `PageHeaderConfirmButton`. / **标签栏可见性**：`TabBarVisibility` 统一管理显隐；移除 `PageHeaderRow` / `PageHeaderConfirmButton`。
+
+### Removed
+- **DictionaryLearner**: replaced by the new dictionary tooling. / **DictionaryLearner**：由新的词库工具取代。
+
+### Security
+- **DeepSeek key handling**: move the hardcoded API key out of `PreconfiguredKeys.swift` into a gitignored `PreconfiguredKeys.local.swift` (seeded from `.example` by `generate-xcodeproj.sh`). / **DeepSeek 密钥处理**：将硬编码 API 密钥移出 `PreconfiguredKeys.swift`，改为 gitignore 的 `PreconfiguredKeys.local.swift`（由 `generate-xcodeproj.sh` 从 `.example` 生成）。
+
+## [0.3.6] - 2026-07-05
+
+### Changed
+- **ASR polish pipeline**: global output contract (no new emojis, punctuation, structure at every intensity), `TranscriptPostProcessor` quality gate, ultra-short utterances skip LLM, removed Off polish tier (legacy `off` migrates to Medium), preceding-text context in keyboard polish path.
+
+## [0.3.4] - 2026-07-04
+
+### Added
+- **Home usage statistics**: new home-screen stats card showing cumulative dictation time, dictation characters, translation characters, and personal-dictionary entry count.
+
+### Changed
+- **Local engine polish path**: local mode now uses the built-in DeepSeek polish path by default, removing the separate "Cloud polish after ASR" toggle and user-facing DeepSeek API key setup.
+- **Provider API keys**: cloud-provider API keys are isolated per provider in Keychain, so switching providers no longer reuses the previous vendor's key.
+- **Translation availability**: translation settings are visible for both local and cloud engines.
+- **DeepSeek provider visibility**: DeepSeek is reserved for the local engine's built-in path and is no longer shown as a cloud-provider picker option.
+
+### Fixed
+- **Home stats rendering**: the stats card gradient background now uses a View-backed background compatible with SwiftUI's type system.
+- **Usage statistics imports**: the usage statistics store now imports the shared module required for translation-state checks.
 
 ## [0.3.0] - 2026-06-24