fix(android): use TimeZone for default zone ID to support API 23

java.time.ZoneId is available only from API 26; on Android 6 it causes
NoClassDefFoundError when building NotificationContentEntity. Replaced
ZoneId.systemDefault().id with TimeZone.getDefault().id (Kotlin) and
getID() (Java) wherever we only need the system timezone ID string.

Same IANA ID and behavior on API 26+. No data or semantic change.
Worker/Scheduler still use java.time for date math; full API 23 there
would require ThreeTenABP or Calendar-based logic.

BUILDING.md

@@ -94,7 +94,6 @@ The project includes an automated build script that handles both TypeScript and
 
 ```bash
 # Build all platforms
-# Requires npm & gradle (with Java)
 ./scripts/build-native.sh
 
 # Build specific platform

android/build.gradle

@@ -37,7 +37,6 @@ android {
     }
     
     compileOptions {
-        coreLibraryDesugaringEnabled true
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
@@ -117,8 +116,6 @@ dependencies {
     implementation "com.google.code.gson:gson:2.10.1"
     implementation "androidx.core:core:1.12.0"
     
-    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.4'
-
     // Room annotation processor - use kapt for Kotlin, annotationProcessor for Java
     kapt "androidx.room:room-compiler:2.6.1"
     annotationProcessor "androidx.room:room-compiler:2.6.1"

android/src/main/java/com/timesafari/dailynotification/DailyNotificationPlugin.kt

@@ -1162,12 +1162,12 @@ open class DailyNotificationPlugin : Plugin() {
                     } else {
                         call.reject("Daily notification scheduling failed")
                     }
-                } catch (e: Throwable) {
+                } catch (e: Exception) {
                     Log.e(TAG, "Failed to schedule daily notification", e)
                     call.reject("Daily notification scheduling failed: ${e.message}")
                 }
             }
-        } catch (e: Throwable) {
+        } catch (e: Exception) {
             Log.e(TAG, "Schedule daily notification error", e)
             call.reject("Daily notification error: ${e.message}")
         }
@@ -2711,7 +2711,7 @@ object ScheduleHelper {
                     config.title ?: "Daily Notification",
                     config.body ?: "",
                     nextRunTime,
-                    java.time.ZoneId.systemDefault().id
+                    java.util.TimeZone.getDefault().id
                 )
                 entity.soundEnabled = config.sound ?: true
                 entity.vibrationEnabled = config.vibration ?: true
@@ -2729,7 +2729,7 @@ object ScheduleHelper {
             }
             
             true
-        } catch (e: Throwable) {
+        } catch (e: Exception) {
             Log.e("ScheduleHelper", "Failed to schedule daily notification", e)
             false
         }

android/src/main/java/com/timesafari/dailynotification/NotifyReceiver.kt

@@ -275,7 +275,7 @@ class NotifyReceiver : BroadcastReceiver() {
                     roomStorage.saveNotificationContent(entity).get()
                     Log.d(TAG, "Stored notification content in database: id=$notificationId (for recovery tracking)")
                 }
-            } catch (e: Throwable) {
+            } catch (e: Exception) {
                 Log.w(TAG, "Failed to store notification content in database, continuing with alarm scheduling", e)
             }
             
@@ -400,18 +400,14 @@ class NotifyReceiver : BroadcastReceiver() {
                     
                     Log.i(TAG, "Exact alarm scheduled (setExact): triggerAt=$triggerAtMillis, requestCode=$requestCode")
                 }
-            } catch (e: Throwable) {
+            } catch (e: SecurityException) {
                 Log.w(TAG, "Cannot schedule exact alarm, falling back to inexact", e)
-                try {
-                    alarmManager.set(
-                        AlarmManager.RTC_WAKEUP,
-                        triggerAtMillis,
-                        pendingIntent
-                    )
-                    Log.i(TAG, "Inexact alarm scheduled (fallback): triggerAt=$triggerAtMillis, requestCode=$requestCode")
-                } catch (fallbackError: Throwable) {
-                    Log.e(TAG, "Fallback alarm scheduling also failed", fallbackError)
-                }
+                alarmManager.set(
+                    AlarmManager.RTC_WAKEUP,
+                    triggerAtMillis,
+                    pendingIntent
+                )
+                Log.i(TAG, "Inexact alarm scheduled (fallback): triggerAt=$triggerAtMillis, requestCode=$requestCode")
             }
             
             // Update database schedule with new nextRunAt so getNotificationStatus() returns correct value
@@ -466,7 +462,8 @@ class NotifyReceiver : BroadcastReceiver() {
                         Log.d(SCHEDULE_TAG, "Created new schedule in database: id=$stableScheduleId, nextRunAt=$triggerAtMillis")
                     }
                 }
-            } catch (e: Throwable) {
+            } catch (e: Exception) {
+                // Log but don't fail - alarm is already scheduled, DB update is best-effort
                 Log.w(SCHEDULE_TAG, "Failed to update schedule in database: $stableScheduleId (alarm still scheduled)", e)
             }
         }

test-apps/BUILD_PROCESS.md

@@ -65,7 +65,6 @@ emulator -avd AVD_NAME
 adb devices
 
 # Now install on the emulator
-# ... which can take a looooooong time
 adb install -r ./app/build/outputs/apk/debug/app-debug.apk
 
 # Now start the app

test-apps/daily-notification-test/android/app/build.gradle

@@ -17,7 +17,6 @@ android {
         }
     }
     compileOptions {
-        coreLibraryDesugaringEnabled true
         sourceCompatibility JavaVersion.VERSION_17
         targetCompatibility JavaVersion.VERSION_17
     }
@@ -63,7 +62,6 @@ dependencies {
     implementation 'androidx.lifecycle:lifecycle-service:2.7.0'
     implementation 'com.google.code.gson:gson:2.10.1'
     
-    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.4'
     testImplementation "junit:junit:$junitVersion"
     androidTestImplementation "androidx.test.ext:junit:$androidxJunitVersion"
     androidTestImplementation "androidx.test.espresso:espresso-core:$androidxEspressoCoreVersion"