feat: Update version to 1.7.13+14, enhance system prompt handling, fix state desync and prevent chat history duplicates

Author: princepspolycap

CHANGELOG.md

@@ -2,6 +2,20 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.7.13+14] - 2025-12-30
+
+### Fixed
+- **System Prompt Injection:** Unified system prompt handling in `restoreChatHistory()` to prepend to first user message (consistent with `chatStream()`). Previously sent as AI message which confused model turn-taking.
+- **Corrupted Model Detection:** Added detection of MediaPipe TFLite errors (`ret_check`, `error building`) and auto-deletes corrupted model files for clean re-download.
+- **State Desync Bug:** Removed stale `_modelReady` local state in chat_screen - now uses reactive `llmService.isInitialized` directly.
+- **Double Initialization:** Removed redundant `_activateModel()` call after `installModel()` in settings_screen.
+- **Chat History Duplicates:** Added `_historyLoaded` guard to prevent duplicate message loading.
+
+### Removed
+- **Dead Code Cleanup:** Removed unused `_toolModel`, `_activeToolModel`, `hasToolModel`, `activeToolModel`, and `initializeToolModel()` - flutter_gemma only supports one active model at a time.
+
+---
+
 ## [1.7.9+10] - 2025-12-27
 
 ### Fixed

ios/version.txt

@@ -1 +1 @@
-13
+14

pubspec.yaml

@@ -2,7 +2,7 @@ name: wing_man
 description: "Wingman - Local AI Dating Assistant"
 publish_to: 'none'
 
-version: 1.7.12+13
+version: 1.7.13+14
 
 environment:
   sdk: ^3.9.2