Open transcript file links in explorer

app/androidApp/src/main/kotlin/com/example/aiapp/FilesScreen.kt

@@ -48,7 +48,22 @@ import kotlinx.coroutines.withContext
  * where it was working. That is what makes a second way in -- from the setups tab -- one more
  * caller rather than any new code here.
  */
-data class FilesTarget(val setup: String, val setupName: String, val start: String)
+data class FilesTarget(
+    val setup: String,
+    val setupName: String,
+    val start: String,
+    /** A document to open immediately; [start] remains the fallback directory. */
+    val file: String? = null,
+)
+
+/** The explorer target for this session's machine, optionally opened on [file]. */
+fun SessionSummary.filesTarget(file: String? = null) =
+    FilesTarget(
+        setup = setup,
+        setupName = setupName,
+        start = cwd?.takeIf { it.isNotBlank() } ?: "~",
+        file = file,
+    )
 
 /** Where the explorer is: in a directory, or in one file. */
 private sealed class Spot(val path: String) {
@@ -72,7 +87,14 @@ private sealed class Spot(val path: String) {
 @Composable
 fun FilesScreen(settings: ServerSettings, target: FilesTarget, onClose: () -> Unit) {
     val scope = rememberCoroutineScope()
-    var here by remember { mutableStateOf<Spot>(Spot.Dir(target.start)) }
+    val initialDirectory =
+        target.file?.let(::parentOf)?.let { Spot.Dir(it) } ?: Spot.Dir(target.start)
+    var here by
+        remember(target) {
+            mutableStateOf<Spot>(
+                target.file?.let { Spot.Doc(it, initialDirectory) } ?: initialDirectory
+            )
+        }
     val listings = remember { mutableStateMapOf<String, LoadState<Listing>>() }
     var creating by remember { mutableStateOf(false) }
     // Edit mode and whether anything has been typed live here rather than in the pane below,