feat(v1.4.0): Checklists feature + WiFi permission cleanup

Features:
- Interactive checklists with tap-to-check, drag & drop sorting
- GitHub-flavored Markdown export (- [ ] / - [x])
- FAB menu for note type selection

Fixes:
- Improved Markdown parsing (robust line-based content extraction)
- Better duplicate filename handling (ID suffix)
- Foreground notification suppression

Privacy:
- Removed ACCESS_WIFI_STATE and CHANGE_WIFI_STATE permissions
  (SSID binding was never used, app only checks connectivity state)

Code Quality:
- Fixed 7 Detekt warnings (SwallowedException, MaxLineLength, MagicNumber)

android/app/build.gradle.kts

@@ -20,8 +20,8 @@ android {
         applicationId = "dev.dettmer.simplenotes"
         minSdk = 24
         targetSdk = 36
-        versionCode = 10  // 🚀 v1.3.2: Lint-Cleanup "Clean Slate"
-        versionName = "1.3.2"  // 🚀 v1.3.2: Code-Qualität-Release (alle einfachen Lint-Issues behoben)
+        versionCode = 11  // 🚀 v1.4.0: Checklists Feature
+        versionName = "1.4.0"  // 🚀 v1.4.0: Checklists, Multi-Device Sync Fixes, UX Improvements
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"