nav-item for hidden_nav_panel adds vertical space to nav-bar on narrow window size

Problem
When the nav-bar switches on narrow windows or devices to a list format (navbar_options = list(collapsible = FALSE)) nav items for hidden nav panels lead to increased vertical size of nav bar menu.
Additionally, when switched to the hidden panel, the corresponding nav-item is underlined.
It might be related to this issue.

The following example is based on the one in the linked issue 1117.

ui <- page_navbar(
  id = "app",
  navbar_options = list(collapsible = FALSE,
                        theme="dark"),
  nav_panel(
    title = "Tab 1",
    input_task_button("to_hidden_panel", "Go to hidden panel")
  ),
  nav_panel_hidden(
    value = "Tab 2",
    "Content"
  )
)

server <- function(input, output, session) {
  observeEvent(input$to_hidden_panel, {
    nav_select("app", selected = "Tab 2")
  })
}

shinyApp(ui, server)

Some session info

─ Session info ──────────────
 setting  value
 version  R version 4.4.3 (2025-02-28)
 os       Ubuntu 24.04.2 LTS
 system   x86_64, linux-gnu
 ui       RStudio
 language de_DE.UTF-8
 collate  de_DE.UTF-8
 ctype    de_DE.UTF-8
 tz       Etc/UTC
 date     2025-06-04
 rstudio  2024.12.1+563 Kousa Dogwood (server)
 pandoc   3.6.4 @ /usr/bin/pandoc
 quarto   1.5.57 @ /usr/local/bin/quarto

─ Packages ────────────
 package      * version date (UTC) lib source
 bslib        * 0.9.0   2025-01-30 [1] RSPM 
 htmltools      0.5.8.1 2024-04-04 [1] RSPM
 shiny        * 1.10.0  2024-12-14 [1] RSPM (R 4.4.0)

Reproduce the supplied example using page_navbar, nav_panel_hidden, and nav_select at a narrow window size, then inspect the navbar styling and hidden-panel navigation behavior. Done means hidden-panel nav items add no vertical space in list mode and the corresponding item is not underlined when the hidden panel is selected.