Export button at the top of the detail actions row too

The long saved report pushed the bottom Export out of sight. It now
sits beside Re-transcribe right under the voice chips, and stays at
the bottom for the end-of-document flow.

app/src/main/kotlin/com/shonar/desktop/Screens.kt

@@ -1081,6 +1081,12 @@ fun DetailScreen(state: DesktopState) {
                 ShonarGhostButton({ state.transcribe() }) {
                     Text(if (hasTranscript) "Re-transcribe" else "Transcribe")
                 }
+                // Export beside the other actions up top — the report is
+                // long and the bottom button was out of sight (user
+                // couldn't find it). Kept at the bottom too.
+                ShonarGhostButton({ showExport = true }) {
+                    Text("Export…")
+                }
             }
             // Summarize progress right where the buttons are: a running
             // summarize must be visible next to the chips that started it.