docs: add release notes and changelog for v4.0.4

Author: LeanBitLab

docs/releasenote/release_notes_v4.0.4.md

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+### 💖 Support Our Work
+* We are committed to making our apps as powerful and polished as possible. As an entirely community-funded project, we rely on your support to keep going, please consider becoming a [sponsor](https://github.com/sponsors/LeanBitLab). A huge thank you to all our current supporters!
+
+## 🚀 What's New in v4.0.4
+
+### 🛠️ Bug Fixes & Features
+- **Custom Icons & Toolbar**: Instant icon reloading when custom icon or icon style preferences change, alongside enhanced split toolbar visibility controls.
+- **Emoji Keyboard & Search**: Cursor-aware inline emoji search, dynamic height measurement, whitespace-terminated query handling, and key navigation fixes (SHIFT, 123, language switch).
+- **Clipboard & Screenshots**: Integrated MediaStore observer for instant screenshot detection, top row margin alignment, and persistent tracking for deleted screenshot URIs.
+- **Gesture Typing**: Automatic gesture input activation upon library installation, simplified gesture library manager UI with auto-status summary, and welcome wizard gesture toggle.
+- **Input & Shift State**: Updated shift state synchronization after swipe deletion in input logic.
+- **Subtypes & Dictionaries**: Automatic persistence of default language subtypes on setup/startup and fixed sub-locale dictionary fallbacks when emoji dictionary is active.
+- **Stability & Crash Guards**: Guarded `RichInputMethodManager` initialization checks in settings screens and fixed JNI x86 checksum constants.
+
+## 📦 Downloads (Choose Your Flavor)
+
+| File | Description | Permissions |
+| :--- | :--- | :--- |
+| **`1-LeanType_4.0.4-standardfull-release.apk`** | **Recommended**. Cloud AI + Handwrite  | Internet | 
+| **`1-LeanType_4.0.4-standard-release.apk`** | **Fdroid Build**. Standard - Foss only | Internet |
+| **`2-LeanType_4.0.4-offline-release.apk`** | **Privacy Focused**. Offline AI | No Internet |
+| **`3-LeanType_4.0.4-offlinelite-release.apk`** | **Minimalist**. Pure FOSS. No AI Integration. | No Internet |

fastlane/metadata/android/en-US/changelogs/4004.txt

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+- Instant icon reloading when custom icon or icon style preferences change.
+- Enhanced emoji search with dynamic height, cursor-aware insertion, and key navigation fixes.
+- Added MediaStore screenshot auto-detection, immediate suggestions, and deletion persistence in Clipboard.
+- Auto-enable gesture input upon library installation and simplified gesture manager UI.
+- Updated shift state after swipe deletion and fixed split toolbar visibility controls.
+- Auto-persisted default language subtypes and sub-locale dictionary fallback fixes.
+- Stability improvements and initialization guards in Settings and JNI.