Replace bare backticks with cli inline markup across all messaging calls

- {.arg} for argument names in stop_/warning_/message_ calls
- {.cls} after "of class" text in format_class() and elsewhere
- {.fun} for function names (replaces `fn()` pattern)
- {.pkg} for tidyverse package names (dplyr, ggplot2)
- {.code} for code literals (TRUE, FALSE, expressions)
- Rewrite print.ab: use cli named-vector with * bullets and code
  highlighting when cli >= 3.0.0; keep plain-text fallback otherwise
- Fix typo in as.sir(): "of must be" -> "or must be"
- switch sir.R verbose notes from message() to message_()

https://claude.ai/code/session_01XHWLohiSTdZvCutwD7ag2b

R/mo_property.R

@@ -584,7 +584,7 @@ mo_is_intrinsic_resistant <- function(x, ab, language = get_AMR_locale(), keep_s
     ab <- rep(ab, length(x))
   }
   if (length(x) != length(ab)) {
-    stop_("length of `x` and `ab` must be equal, or one of them must be of length 1.")
+    stop_("length of {.arg x} and {.arg ab} must be equal, or one of them must be of length 1.")
   }
 
   # show used version number once per session (AMR_env will reload every session)
@@ -943,7 +943,7 @@ mo_url <- function(x, open = FALSE, language = get_AMR_locale(), keep_synonyms =
 
   if (isTRUE(open)) {
     if (length(u) > 1) {
-      warning_("in `mo_url()`: only the first URL will be opened, as R's built-in function `browseURL()` only suports one string.")
+      warning_("in {.fun mo_url}: only the first URL will be opened, as R's built-in function {.fun browseURL} only suports one string.")
     }
     utils::browseURL(u[1L])
   }