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/ui/components/ProfileSwitchSheet.kt

@@ -0,0 +1,78 @@
+package com.hsdiary.ui.components
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.*
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+
+data class ProfileSwitchItem(
+    val id: Long,
+    val name: String,
+    val avatarColor: Color,
+    val isActive: Boolean
+)
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun ProfileSwitchSheet(
+    profiles: List<ProfileSwitchItem>,
+    onProfileSelected: (Long) -> Unit,
+    onDismiss: () -> Unit
+) {
+    var confirmTarget by remember { mutableStateOf<ProfileSwitchItem?>(null) }
+
+    ModalBottomSheet(onDismissRequest = onDismiss) {
+        Column(modifier = Modifier.padding(horizontal = 24.dp).padding(bottom = 32.dp)) {
+            Text(
+                text = "Switch Profile",
+                style = MaterialTheme.typography.titleMedium,
+                modifier = Modifier.padding(bottom = 16.dp)
+            )
+            profiles.forEach { profile ->
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .clickable {
+                            if (!profile.isActive) confirmTarget = profile
+                            else onDismiss()
+                        }
+                        .padding(vertical = 12.dp),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(16.dp)
+                ) {
+                    AvatarDot(name = profile.name, avatarColor = profile.avatarColor)
+                    Text(
+                        text = profile.name,
+                        style = MaterialTheme.typography.bodyLarge,
+                        modifier = Modifier.weight(1f)
+                    )
+                    if (profile.isActive) {
+                        Badge { Text("Active") }
+                    }
+                }
+            }
+        }
+    }
+
+    confirmTarget?.let { target ->
+        AlertDialog(
+            onDismissRequest = { confirmTarget = null },
+            title = { Text("Switch Profile") },
+            text = { Text("Switch to ${target.name}?") },
+            confirmButton = {
+                TextButton(onClick = {
+                    onProfileSelected(target.id)
+                    confirmTarget = null
+                    onDismiss()
+                }) { Text("Switch") }
+            },
+            dismissButton = {
+                TextButton(onClick = { confirmTarget = null }) { Text("Cancel") }
+            }
+        )
+    }
+}