R test explorer doesn't surface unhandled warnings well

System details:

Positron and OS details:

Positron Version: 2025.07.0 (Universal) build 204
Code - OSS Version: 1.100.3
Commit: 03ae7a5393c776bb24c23d2aa6a6bfbba90cbc5e
Date: 2025-06-30T16:28:59.945Z (3 wks ago)
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.5.0

Session details:

R 4.5.0

Describe the issue:

Tests only show errors, not warnings in the Positron test pane

Steps to reproduce the issue:

1. Create a test that emits a warning
2. Use the test keyboard shortcut to run test through the Positron IDE

e.g.

example_function <- function() {
  # This function does nothing
  warning("This is an example warning from example_function.")
  return(NULL)
}

test_that("example_function()", {
  expect_null(example_function())
})

Expected or desired behavior:

I would like to see some sort of indication that there are warnings, e.g. a yellow warning icon

Reproduce the issue in the Positron test pane using the R example that calls warning() and the test_that() case, then inspect how test results are surfaced. The work is done when an R test warning produces a clear indication, such as a warning icon, alongside the existing test result display.