test: the duration limit is checked against what is converted, not what the header claims (red; adversarial review F2)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/web/uploads_handler_test.go

@@ -460,3 +460,21 @@ func TestUploadStatus_AVeryLongListOfContestedSpotsIsShortenedWithItsTrueCount(t
 	assert.NotContains(t, b, ">b119<", "the page does not render every one")
 	assert.Contains(t, b, "70 more", "120 stored, 50 shown")
 }
+
+func TestUploadStatus_ALengthFailureIsExplainedInWordsAndNotAsAGenericError(t *testing.T) {
+	app, _ := newUploadApp(t, audioOK, 200<<20)
+	tests := []struct{ kind, want string }{
+		{"audio_too_long", "longer than the limit"},
+		{"audio_incomplete", "ends much earlier than"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.kind, func(t *testing.T) {
+			id := seedUpload(t, userID, "m-"+tt.kind, "failed", tt.kind)
+
+			b := body(t, do(t, app, get("/uploads/"+id+"/status")))
+
+			assert.Contains(t, b, tt.want)
+			assert.NotContains(t, b, "This upload failed. Please upload it again.")
+		})
+	}
+}