Fix check-depends-only failure by correcting tryCatch error handler signature in shiny version guard

[Copilot]

Scheduled package checks from shinycoreci started failing on main in R-CMD-check / check-depends-only. The failure came from test_shiny_version() raising unused argument (cond) when shiny is absent and tryCatch invokes the error handler with a condition argument.

• Root cause

  • test_shiny_version() used an error handler with zero parameters (function()), which is incompatible with condition-passing handler invocation.

• Code change

  • Updated the error handler in R/shinyModule.R to accept the condition argument and continue returning FALSE when shiny is unavailable.
  • This preserves existing behavior (graceful skip/fallback when shiny is not installed) while removing the runtime error in depends-only checks.

• Patch snippet

  test_shiny_version <- function() {
    tryCatch({
      utils::packageVersion("shiny") >= shiny_version_required()
    }, error = function(e) {
      # package not found
      FALSE
    })
  }