docs: Add comprehensive documentation for QR feature module

feature/qr/src/commonMain/kotlin/org/mifos/mobile/feature/qr/di/QrModule.kt

@@ -15,6 +15,12 @@ import org.mifos.mobile.feature.qr.qr.QrCodeReaderViewModel
 import org.mifos.mobile.feature.qr.qrCodeDisplay.QrCodeDisplayViewModel
 import org.mifos.mobile.feature.qr.qrCodeImport.QrCodeImportViewModel
 
+/**
+ * Koin module for the QR feature.
+ *
+ * This module is responsible for providing all the ViewModels used within the QR code
+ * feature of the application.
+ */
 val QrModule = module {
     viewModelOf(::QrCodeImportViewModel)
     viewModelOf(::QrCodeReaderViewModel)

feature/qr/src/commonMain/kotlin/org/mifos/mobile/feature/qr/navigation/QrNavGraph.kt

@@ -24,13 +24,27 @@ import org.mifos.mobile.feature.qr.qrCodeDisplay.qrDisplayDestination
 import org.mifos.mobile.feature.qr.qrCodeImport.navigateToQrImportScreen
 import org.mifos.mobile.feature.qr.qrCodeImport.qrImportDestination
 
+/**
+ * Type-safe navigation route for the entire QR feature's nested navigation graph.
+ */
 @Serializable
 data object QrGraphRoute
 
+/**
+ * Navigates to the nested QR navigation graph.
+ *
+ * @param navOptions Optional navigation options.
+ */
 fun NavController.navigateToQrGraph(navOptions: NavOptions? = null) {
     this.navigate(QrGraphRoute, navOptions)
 }
 
+/**
+ * Builds the nested navigation graph for the QR feature.
+ *
+ * @param navController The NavController for the graph.
+ * @param openBeneficiaryApplication Callback to navigate to the beneficiary application screen.
+ */
 fun NavGraphBuilder.qrNavGraph(
     navController: NavController,
     openBeneficiaryApplication: (Beneficiary, BeneficiaryState) -> Unit,

feature/qr/src/commonMain/kotlin/org/mifos/mobile/feature/qr/qr/QrCodeReaderRoute.kt

@@ -17,13 +17,28 @@ import org.mifos.mobile.core.model.entity.beneficiary.Beneficiary
 import org.mifos.mobile.core.model.enums.BeneficiaryState
 import org.mifos.mobile.core.ui.composableWithPushTransitions
 
+/**
+ * Represents the type-safe navigation route for the QR Code Reader screen.
+ */
 @Serializable
 data object QrCodeReaderRoute
 
+/**
+ * Navigates to the QR Code Reader screen.
+ * @param navOptions Optional navigation options.
+ */
 fun NavController.navigateToQrReaderScreen(navOptions: NavOptions? = null) {
     this.navigate(QrCodeReaderRoute, navOptions)
 }
 
+/**
+ * Defines the composable destination for the QR Code Reader screen in the navigation graph.
+ *
+ * @param navigateBack Callback to navigate to the previous screen.
+ * @param navigateToQrImportScreen Callback to navigate to the QR import screen.
+ * @param openBeneficiaryApplication Callback to open the beneficiary application screen
+ * with the parsed beneficiary data.
+ */
 fun NavGraphBuilder.qrReaderDestination(
     navigateBack: () -> Unit,
     navigateToQrImportScreen: () -> Unit,

feature/qr/src/commonMain/kotlin/org/mifos/mobile/feature/qr/qr/QrCodeReaderScreen.kt

@@ -64,6 +64,16 @@ import org.mifos.mobile.core.qr.QrScannerWithPermissions
 import org.mifos.mobile.core.ui.component.MifosPoweredCard
 import org.mifos.mobile.core.ui.utils.EventsEffect
 
+/**
+ * The main composable for the QR Code Reader screen. It handles state, events,
+ * and composes the UI content and dialogs.
+ *
+ * @param navigateBack Callback to navigate to the previous screen.
+ * @param openBeneficiaryApplication Callback to open the beneficiary application with parsed data.
+ * @param navigateToQrImportScreen Callback to navigate to the screen for importing QR from an image.
+ * @param modifier The [Modifier] to be applied to this composable.
+ * @param viewModel The [QrCodeReaderViewModel] for this screen.
+ */
 @Composable
 internal fun QrCodeReaderScreen(
     navigateBack: () -> Unit,
@@ -104,6 +114,12 @@ internal fun QrCodeReaderScreen(
     )
 }
 
+/**
+ * Displays dialogs based on the current [QrCodeReaderState].
+ *
+ * @param state The current state of the QR reader screen.
+ * @param onAction Callback for user actions within the dialog.
+ */
 @Composable
 private fun QrCodeReaderDialog(
     state: QrCodeReaderState,
@@ -123,6 +139,12 @@ private fun QrCodeReaderDialog(
     }
 }
 
+/**
+ * The main content of the QR Code Reader screen, including the camera preview and UI controls.
+ *
+ * @param modifier The [Modifier] to be applied to this composable.
+ * @param onAction Callback for user actions on the screen.
+ */
 @Composable
 private fun QrCodeReaderContent(
     modifier: Modifier = Modifier,
@@ -237,6 +259,10 @@ private fun QrCodeReaderContent(
     }
 }
 
+/**
+ * A custom [Modifier] that draws four corners around a composable,
+ * creating a visual guide for the QR scanner.
+ */
 private fun Modifier.drawQrCorners(): Modifier = drawWithContent {
     drawContent()
 
@@ -306,6 +332,9 @@ private fun Modifier.drawQrCorners(): Modifier = drawWithContent {
     )
 }
 
+/**
+ * A Jetpack Compose Preview for the [QrCodeReaderContent] composable.
+ */
 @Preview
 @Composable
 private fun QrCodeReaderScreenPreview() {

feature/qr/src/commonMain/kotlin/org/mifos/mobile/feature/qr/qrCodeDisplay/QrCodeDisplayRoute.kt

@@ -15,13 +15,30 @@ import androidx.navigation.NavOptions
 import kotlinx.serialization.Serializable
 import org.mifos.mobile.core.ui.composableWithPushTransitions
 
+/**
+ * Represents the type-safe navigation route for the QR Code Display screen.
+ * It can optionally take a `qrString` to display, otherwise it will generate one.
+ *
+ * @param qrString The string to be encoded and displayed as a QR code.
+ */
 @Serializable
 data class QrCodeDisplayRoute(val qrString: String = "")
 
+/**
+ * Navigates to the QR Code Display screen.
+ *
+ * @param qrString The string to be encoded into the QR code.
+ * @param navOptions Optional navigation options.
+ */
 fun NavController.navigateToQrDisplayScreen(qrString: String, navOptions: NavOptions? = null) {
     this.navigate(QrCodeDisplayRoute(qrString), navOptions)
 }
 
+/**
+ * Defines the composable destination for the QR Code Display screen in the navigation graph.
+ *
+ * @param navigateBack Callback to navigate to the previous screen.
+ */
 fun NavGraphBuilder.qrDisplayDestination(
     navigateBack: () -> Unit,
 ) {

feature/qr/src/commonMain/kotlin/org/mifos/mobile/feature/qr/qrCodeDisplay/QrCodeDisplayScreen.kt

@@ -49,6 +49,14 @@ import org.mifos.mobile.core.designsystem.theme.MifosTypography
 import org.mifos.mobile.core.ui.component.MifosPoweredCard
 import org.mifos.mobile.core.ui.utils.EventsEffect
 
+/**
+ * The main entry point for the QR Code Display screen. This composable handles state
+ * from the ViewModel and events.
+ *
+ * @param navigateBack Callback to navigate to the previous screen.
+ * @param modifier The [Modifier] to be applied to this composable.
+ * @param viewModel The [QrCodeDisplayViewModel] for this screen.
+ */
 @Composable
 internal fun QrCodeDisplayScreen(
     navigateBack: () -> Unit,
@@ -72,6 +80,14 @@ internal fun QrCodeDisplayScreen(
     )
 }
 
+/**
+ * The private, stateless version of the QR Code Display screen.
+ * This composable is responsible for the UI layout and generating the QR code painter.
+ *
+ * @param state The current [QrCodeDisplayState] to render.
+ * @param modifier The [Modifier] to be applied to this composable.
+ * @param onAction Callback for user actions on the screen.
+ */
 @Suppress("UnusedPrivateProperty")
 @Composable
 private fun QrCodeDisplayScreen(
@@ -103,6 +119,13 @@ private fun QrCodeDisplayScreen(
     )
 }
 
+/**
+ * The main content of the QR code display screen.
+ * It lays out the title, instructions, QR code image, and generation date.
+ *
+ * @param painter The [Painter] used to draw the QR code.
+ * @param modifier The [Modifier] to be applied to this composable.
+ */
 @Composable
 private fun QrCodeDisplayContent(
     painter: Painter,
@@ -163,6 +186,9 @@ private fun QrCodeDisplayContent(
     }
 }
 
+/**
+ * A Jetpack Compose Preview for the [QrCodeDisplayScreen] composable.
+ */
 @Preview
 @Composable
 private fun QrCodeDisplayScreenPreview() {

feature/qr/src/commonMain/kotlin/org/mifos/mobile/feature/qr/qrCodeImport/QrCodeImportRoute.kt

@@ -17,13 +17,27 @@ import org.mifos.mobile.core.model.entity.beneficiary.Beneficiary
 import org.mifos.mobile.core.model.enums.BeneficiaryState
 import org.mifos.mobile.core.ui.composableWithPushTransitions
 
+/**
+ * Represents the type-safe navigation route for the QR Code Import screen.
+ */
 @Serializable
 data object QrCodeImportRoute
 
+/**
+ * Navigates to the QR Code Import screen.
+ *
+ * @param navOptions Optional navigation options.
+ */
 fun NavController.navigateToQrImportScreen(navOptions: NavOptions? = null) {
     this.navigate(QrCodeImportRoute, navOptions)
 }
 
+/**
+ * Defines the composable destination for the QR Code Import screen in the navigation graph.
+ *
+ * @param navigateBack Callback to navigate to the previous screen.
+ * @param openBeneficiaryApplication Callback to open the beneficiary application with the parsed beneficiary data.
+ */
 fun NavGraphBuilder.qrImportDestination(
     navigateBack: () -> Unit,
     openBeneficiaryApplication: (Beneficiary, BeneficiaryState) -> Unit,

feature/qr/src/commonMain/kotlin/org/mifos/mobile/feature/qr/qrCodeImport/QrCodeImportScreen.kt

@@ -36,6 +36,15 @@ import org.mifos.mobile.core.ui.component.MifosPoweredCard
 import org.mifos.mobile.core.ui.component.MifosProgressIndicatorOverlay
 import org.mifos.mobile.core.ui.utils.EventsEffect
 
+/**
+ * The main composable for the QR Code Import screen. It connects the UI to the ViewModel,
+ * handles state and events, and orchestrates navigation.
+ *
+ * @param navigateBack Callback to navigate to the previous screen.
+ * @param openBeneficiaryApplication Callback to open the beneficiary application with parsed data.
+ * @param modifier The [Modifier] to be applied to this composable.
+ * @param viewModel The [QrCodeImportViewModel] for this screen.
+ */
 @Composable
 internal fun QrCodeImportScreen(
     navigateBack: () -> Unit,
@@ -73,6 +82,13 @@ internal fun QrCodeImportScreen(
     )
 }
 
+/**
+ * Displays dialogs based on the current [QrCodeImportState], such as loading indicators
+ * or error messages.
+ *
+ * @param state The current state of the QR import screen.
+ * @param onAction Callback for user actions within the dialog.
+ */
 @Composable
 private fun QrCodeDialog(
     state: QrCodeImportState,
@@ -92,6 +108,13 @@ private fun QrCodeDialog(
     }
 }
 
+/**
+ * The main content layout for the QR Code Import screen, including the scaffold and
+ * bottom bar.
+ *
+ * @param modifier The [Modifier] to be applied to this composable.
+ * @param onAction Callback for user actions on the screen.
+ */
 @Composable
 private fun QrCodeImportScreenContent(
     modifier: Modifier = Modifier,
@@ -126,12 +149,26 @@ private fun QrCodeImportScreenContent(
     }
 }
 
+/**
+ * Expect composable for a platform-specific image picker UI.
+ * This allows each platform (Android, iOS) to implement its own native
+ * image selection logic.
+ *
+ * @param onProceed Callback that provides the selected [ImageBitmap] to the caller.
+ * @param modifier The [Modifier] to be applied to the picker composable.
+ */
 @Composable
 expect fun QrCodeImagePicker(
     onProceed: (bitmap: ImageBitmap) -> Unit,
     modifier: Modifier = Modifier,
 )
 
+/**
+ * A wrapper composable that hosts the platform-specific [QrCodeImagePicker].
+ *
+ * @param proceedClicked Callback invoked when an image is selected and ready to be processed.
+ * @param modifier The [Modifier] to be applied to this composable.
+ */
 @Composable
 private fun QrCodeImportContent(
     proceedClicked: (bitmap: ImageBitmap) -> Unit,
@@ -145,6 +182,9 @@ private fun QrCodeImportContent(
     )
 }
 
+/**
+ * A Jetpack Compose Preview for the [QrCodeImportScreenContent] composable.
+ */
 @Preview
 @Composable
 private fun QrCodeImportPreview() {