Tier 0: render what the services already decided, honestly

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/quickshell/modules/settings/SoundPage.qml

@@ -100,7 +100,12 @@ SettingsPage {
         // level meter above says something is arriving, not that it is you.
         ActionRow {
             label: "Test your microphone"
-            detail: "Record a few seconds and play it back through the selected output"
+            // A test that fails does it by being silent, which is the same
+            // thing a broken microphone does. The reason takes the detail's
+            // place so the two can be told apart.
+            detail: SoundTest.lastError !== ""
+                ? SoundTest.lastError
+                : "Record a few seconds and play it back through the selected output"
             divider: captureRow.visible
             action: {
                 if (SoundTest.micTestState === "recording")