Add ability to clear selected file in upload tab

- Add clearSelectedFile() function to MainViewModel
- Auto-clear selected file after successful upload
- Add remove button (X) to selected file card in GeneralUploadTab

app/src/main/java/com/mattintech/simplelogupload/ui/screens/tabs/GeneralUploadTab.kt

@@ -11,6 +11,7 @@ import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.layout.*
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.Upload
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
@@ -194,12 +195,27 @@ fun GeneralUploadTab(
                 modifier = Modifier.fillMaxWidth()
             ) {
                 Column(modifier = Modifier.padding(16.dp)) {
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
+                        horizontalArrangement = Arrangement.SpaceBetween,
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
                         Text(
                             text = "Selected File",
                             style = MaterialTheme.typography.titleSmall,
                             color = MaterialTheme.colorScheme.primary
                         )
-                    Spacer(modifier = Modifier.height(4.dp))
+                        IconButton(
+                            onClick = { viewModel.clearSelectedFile() },
+                            enabled = !uiState.isLoading
+                        ) {
+                            Icon(
+                                Icons.Default.Close,
+                                contentDescription = "Remove selected file",
+                                tint = MaterialTheme.colorScheme.onSurfaceVariant
+                            )
+                        }
+                    }
                     Text(
                         text = fileName,
                         style = MaterialTheme.typography.bodyMedium

app/src/main/java/com/mattintech/simplelogupload/viewmodel/MainViewModel.kt

@@ -139,7 +139,9 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
                             showUploadResultDialog = true,
                             uploadProgress = 0,
                             bytesUploaded = 0,
-                            totalBytes = 0
+                            totalBytes = 0,
+                            selectedFile = null,
+                            selectedFileName = null
                         )
                     }
                     AppConstants.ACTION_UPLOAD_ERROR -> {
@@ -328,6 +330,16 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         )
     }
 
+    /**
+     * Clear the selected file
+     */
+    fun clearSelectedFile() {
+        _uiState.value = _uiState.value.copy(
+            selectedFile = null,
+            selectedFileName = null
+        )
+    }
+
     /**
      * Show upload parameters dialog
      */