Declare knitr as a runtime dependency - #282

Problem

After installing the development version with only its required dependencies, the documented extendShinyjs() example fails while constructing the UI:

library(shiny)
library(shinyjs)
fluidPage(
  useShinyjs(),
  extendShinyjs(text = "shinyjs.pageCol = function(params) {}", functions = "pageCol")
)
# Error in loadNamespace(x): there is no package called 'knitr'

insertHead() unconditionally calls knitr::opts_knit$get("rmarkdown.runtime"), including in ordinary Shiny apps, but knitr is only in Suggests. inlineCSS() also uses this helper.

Change

Move the existing knitr dependency, keeping its minimum version, from Suggests to Imports so normal dependency installation includes the package already needed at runtime. No behavior or generated documentation changes.

Validation

• R 4.3.3 / Shiny 1.8.0: installed shinyjs, derived its recursive required-dependency closure from installed package metadata, and restricted .libPaths() to that closure plus base packages. On master 59a0fae, the documented UI fails with missing knitr; with this change, the same closure includes knitr and the UI constructs successfully.
• Source package install/load checks pass.
• Existing test-hidden.R: 23 expectations pass.
• Synthetic loopback Shiny app in Chrome: guide form, module namespaces, visibility/state/reset, and extension init/parameters/defaults exercised. A separate existing removeEvent issue is not addressed by this dependency-only change.
• Full cross-platform R-CMD-check and shinytest2 suite not run locally.

Summary by CodeRabbit

• Chores
  • Updated package configuration. No changes were made to public interfaces or user-facing functionality.