test(web): read the response body once; match the message's real case

Two defects in my red tests, found when going green: body() drains the
recorder so a second call read empty, and two assertions expected a different
case than the user-facing message. The assertions were not weakened.

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

internal/web/uploads_handler_test.go

@@ -189,8 +189,9 @@ func TestUploadPost_RejectionsAreSynchronousWithAMessageAndNoRow(t *testing.T) {
 			rec := do(t, app, uploadReq(t, "t", "r.m4a", []byte(tt.content)))
 
 			assert.Equal(t, tt.wantStatus, rec.Code)
+			b := body(t, rec)
 			for _, s := range tt.wantInBody {
-				assert.Contains(t, body(t, rec), s)
+				assert.Contains(t, b, s)
 			}
 			var n int
 			require.NoError(t, rawPool(t).QueryRow(context.Background(),
@@ -207,7 +208,7 @@ func TestUploadPost_WithNoFilePartIs400(t *testing.T) {
 	rec := do(t, app, uploadReq(t, "only a title", "", nil))
 
 	assert.Equal(t, http.StatusBadRequest, rec.Code)
-	assert.Contains(t, body(t, rec), "choose")
+	assert.Contains(t, body(t, rec), "Choose an audio file")
 }
 
 func TestUploadRoutes_AreNotMountedWithoutAnUploader(t *testing.T) {
@@ -240,7 +241,7 @@ func TestUploadStatus_UnfinishedStatesKeepPollingTerminalStatesStop(t *testing.T
 		polls                 bool
 		wantInBody            string
 	}{
-		{"queued", "queued", "", true, "queued"},
+		{"queued", "queued", "", true, "Queued"},
 		{"transcribing", "transcribing", "", true, "ranscrib"},
 		{"done", "done", "Synthetic transcript text.", false, "Synthetic transcript text."},
 		{"failed interrupted", "failed", "interrupted", false, "upload it again"},