Fix logout, share code display, loading states, and multi-user support

iOS Logout Fix:
- Use @EnvironmentObject in MainTabView and ProfileTabView
- Pass loginViewModel from LoginView to MainTabView
- Handle logout by dismissing main tab when isAuthenticated becomes false
- Logout button now properly returns user to login screen

Share Code UX:
- Clear share code on ManageUsers screen open (iOS & Android)
- Remove auto-loading of share codes
- User must explicitly generate code each time
- Improves security with fresh codes

Loading State Improvements:
- iOS ResidenceDetailView shows loading immediately on navigation
- Android ResidenceDetailScreen enhanced with "Loading residence..." text
- Better user feedback during API calls

Multi-User Support:
- Add isPrimaryOwner and userCount to ResidenceWithTasks model
- Update iOS toResidences() extension to include new fields
- Sync with backend API changes for shared user access

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

composeApp/src/commonMain/kotlin/com/example/mycrib/models/Residence.kt

@@ -8,6 +8,8 @@ data class Residence(
     val id: Int,
     val owner: Int? = null,
     @SerialName("owner_username") val ownerUsername: String,
+    @SerialName("is_primary_owner") val isPrimaryOwner: Boolean = false,
+    @SerialName("user_count") val userCount: Int = 1,
     val name: String,
     @SerialName("property_type") val propertyType: String,
     @SerialName("street_address") val streetAddress: String,
@@ -101,6 +103,8 @@ data class ResidenceWithTasks(
     val id: Int,
     val owner: Int,
     @SerialName("owner_username") val ownerUsername: String,
+    @SerialName("is_primary_owner") val isPrimaryOwner: Boolean = false,
+    @SerialName("user_count") val userCount: Int = 1,
     val name: String,
     @SerialName("property_type") val propertyType: String,
     @SerialName("street_address") val streetAddress: String,
@@ -136,4 +140,50 @@ data class MyResidencesSummary(
 data class MyResidencesResponse(
     val summary: MyResidencesSummary,
     val residences: List<ResidenceWithTasks>
+)
+
+// Share Code Models
+@Serializable
+data class ResidenceShareCode(
+    val id: Int,
+    val code: String,
+    val residence: Int,
+    @SerialName("residence_name") val residenceName: String,
+    @SerialName("created_by") val createdBy: Int,
+    @SerialName("created_by_username") val createdByUsername: String,
+    @SerialName("is_active") val isActive: Boolean,
+    @SerialName("created_at") val createdAt: String,
+    @SerialName("expires_at") val expiresAt: String?
+)
+
+@Serializable
+data class JoinResidenceRequest(
+    val code: String
+)
+
+@Serializable
+data class JoinResidenceResponse(
+    val message: String,
+    val residence: Residence
+)
+
+// User Management Models
+@Serializable
+data class ResidenceUser(
+    val id: Int,
+    val username: String,
+    val email: String,
+    @SerialName("first_name") val firstName: String?,
+    @SerialName("last_name") val lastName: String?
+)
+
+@Serializable
+data class ResidenceUsersResponse(
+    @SerialName("owner_id") val ownerId: Int,
+    val users: List<ResidenceUser>
+)
+
+@Serializable
+data class RemoveUserResponse(
+    val message: String
 )