fix: download PDF/DOCX exports through authenticated client instead of browser

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

app/src/main/AndroidManifest.xml

@@ -34,6 +34,16 @@
             android:name=".ui.AdminActivity"
             android:exported="false" />
 
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
+
     </application>
 
 </manifest>

app/src/main/java/com/example/resbuilder/data/remote/ApiClient.kt

@@ -313,4 +313,21 @@ object ApiClient {
 
     fun getExportPdfUrl(jobId: String): String = "$API_BASE/export/$jobId/pdf"
     fun getExportDocxUrl(jobId: String): String = "$API_BASE/export/$jobId/docx"
+
+    @Throws(IOException::class)
+    fun downloadExport(url: String): ByteArray {
+        val req = Request.Builder()
+            .url(url)
+            .build()
+        client.newCall(req).execute().use { res ->
+            if (!res.isSuccessful) {
+                val errBody = res.body?.string()
+                val detail = try {
+                    gson.fromJson(errBody, Map::class.java)["detail"] as? String
+                } catch (_: Exception) { null }
+                throw IOException(detail ?: "Export failed")
+            }
+            return res.body?.bytes() ?: throw IOException("Empty response")
+        }
+    }
 }

app/src/main/java/com/example/resbuilder/ui/ResultFragment.kt

@@ -13,11 +13,14 @@ import android.webkit.WebView
 import android.widget.TextView
 import android.widget.Toast
 import androidx.core.content.ContextCompat
+import androidx.core.content.FileProvider
 import androidx.fragment.app.Fragment
 import com.example.resbuilder.R
 import com.example.resbuilder.data.model.Job
 import com.example.resbuilder.data.remote.ApiClient
 import com.google.android.material.button.MaterialButton
+import java.io.File
+import java.io.FileOutputStream
 
 class ResultFragment : Fragment() {
 
@@ -86,14 +89,58 @@ class ResultFragment : Fragment() {
         newButton.setOnClickListener { listener?.onNewJob() }
 
         jobId?.let { id ->
-            pdfButton.setOnClickListener { openUrl(ApiClient.getExportPdfUrl(id)) }
+            pdfButton.setOnClickListener { downloadAndOpen(id, "pdf") }
-            docxButton.setOnClickListener { openUrl(ApiClient.getExportDocxUrl(id)) }
+            docxButton.setOnClickListener { downloadAndOpen(id, "docx") }
         } ?: run {
             pdfButton.isEnabled = false
             docxButton.isEnabled = false
         }
     }
 
+    private fun downloadAndOpen(jobId: String, format: String) {
+        val url = if (format == "pdf") ApiClient.getExportPdfUrl(jobId) else ApiClient.getExportDocxUrl(jobId)
+        val dir = File(requireContext().cacheDir, "exports")
+        if (!dir.exists()) dir.mkdirs()
+        val safeId = jobId.replace("/", "_").replace("..", "_").take(8)
+        val file = File(dir, "$safeId.$format")
+
+        pdfButton.isEnabled = false
+        docxButton.isEnabled = false
+        Toast.makeText(context, R.string.exporting, Toast.LENGTH_SHORT).show()
+
+        Thread {
+            try {
+                val bytes = ApiClient.downloadExport(url)
+                FileOutputStream(file).use { it.write(bytes) }
+                requireActivity().runOnUiThread {
+                    pdfButton.isEnabled = true
+                    docxButton.isEnabled = true
+                    openFile(file)
+                }
+            } catch (e: Exception) {
+                requireActivity().runOnUiThread {
+                    pdfButton.isEnabled = true
+                    docxButton.isEnabled = true
+                    Toast.makeText(context, e.message ?: getString(R.string.export_failed), Toast.LENGTH_LONG).show()
+                }
+            }
+        }.start()
+    }
+
+    private fun openFile(file: File) {
+        val uri = FileProvider.getUriForFile(requireContext(), "${requireContext().packageName}.fileprovider", file)
+        val mime = if (file.extension == "pdf") "application/pdf" else "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
+        val intent = Intent(Intent.ACTION_VIEW).apply {
+            setDataAndType(uri, mime)
+            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+        }
+        try {
+            startActivity(intent)
+        } catch (e: Exception) {
+            Toast.makeText(context, R.string.export_no_viewer, Toast.LENGTH_LONG).show()
+        }
+    }
+
     private fun copyText() {
         val raw = rawContent
         if (raw.isNullOrEmpty()) {
@@ -105,11 +152,6 @@ class ResultFragment : Fragment() {
         Toast.makeText(context, R.string.copied_to_clipboard, Toast.LENGTH_SHORT).show()
     }
 
-    private fun openUrl(url: String) {
-        val intent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
-        startActivity(intent)
-    }
-
     fun setOnNewListener(l: OnNewListener) {
         listener = l
     }

app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths>
+    <cache-path
+        name="exports"
+        path="exports/" />
+</paths>