Initial commit: Implement base health and cycle tracking application.

- Set up Android project structure with Gradle 8.7, Kotlin 2.0, and Hilt.
- Implement Room database with entities for Profiles, Day Logs, Conditions, Cycle Records, and Intimacy Logs.
- Integrate Jetpack Compose for the UI layer including Navigation and Material3.
- Develop a cycle prediction engine to calculate menstruation, fertile windows, and ovulation based on user history.
- Implement core screens:
    - **Onboarding:** Initial profile setup for female/male users.
    - **Calendar:** Monthly view showing cycle phases, logged symptoms, and intimacy records.
    - **Day Detail:** Detailed logging for symptoms (with ratings), period status, notes, and intimacy encounters.
    - **Cycle Insights:** Visualization of cycle phases and historical cycle length trends.
    - **Health Trends:** Frequency and recurrence analysis of logged health conditions over various time ranges.
    - **Settings:** Profile management, data clearing, and app theme configuration.
- Add DataStore for managing user preferences such as active profile and onboarding status.

Signed-off-by: whitlocktech <whitlocktech@gmail.com>

app/src/main/java/com/hsdiary/MainActivity.kt

@@ -0,0 +1,22 @@
+package com.hsdiary
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import com.hsdiary.ui.navigation.AppNavigation
+import com.hsdiary.ui.theme.HSDiaryTheme
+import dagger.hilt.android.AndroidEntryPoint
+
+@AndroidEntryPoint
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContent {
+            HSDiaryTheme {
+                AppNavigation()
+            }
+        }
+    }
+}