[Bug]: PCA module fails when trying to add a new card

[m7pr]

What happened?

[WARN] 2025-10-21 15:23:48.1568 pid:10420 token:[46fd689f] te[WARN] 2025-10-21 15:23:48.1568 pid:10420 token:[46fd689f] teal.modules.hermes 'experiments' dropped; see 'drops()'       
al.modules.hermes 'experiments' dropped; see 'drops()'       
Warning: Error in as.character.default: no method for coercing this S4 class to a vector
  95: as.character.default
  93: paste
  92: commonmark::markdown_html
  90: .toHTML.default [C:/Rprojects/teal.reporter/R/toHTML.R#122]
  87: toHTML.default [C:/Rprojects/teal.reporter/R/toHTML.R#111]
  85: lapply
  84: reporter$append_cards [C:/Rprojects/teal.reporter/R/Reporter.R#63]
  83: observe [C:/Rprojects/teal.reporter/R/add_card.R#195]
  82: <observer:observeEvent(input$add_card_ok)>
   3: runApp
   2: print.shiny.appobj
   1: <Anonymous>

Relevant log output

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