[schloerke]

2026 tidy upkeep. Closes rstudio/shinytest2#466.

Each checklist item is its own commit.

Changes

• Fix broken and moved URLs found by urlchecker::url_check()
• Add a package-level help topic (?shinytest2)
• Add lifecycle badge SVGs (the load_app_env() superseded badge was missing its image)
• Use the tidy hex logo and rebuild favicons
• Add the tidyverse code of conduct
• Use pak::pak() in the README install steps
• Improve alt text for the CI badge in the use-ci article
• Drop the redundant check_installed("globals") calls (globals is in Imports)
• Use cli for errors and warnings. app_abort() / app_warn() now call cli_abort() / cli_warn(). Text that may contain braces (logs, JS, condition messages) is escaped with new cli_escape() / cli_lines() helpers.
• Set up air (air.toml, VS Code settings). The code is not reformatted here; that will be a separate PR.
• Require R >= 4.1
• Use \(x) for anonymous functions in articles (package code and Shiny server functions unchanged)
• Convert vignette chunk options to in-body YAML
• Give bare expect_error() calls an error pattern
• Tidy DESCRIPTION

Skipped

• README.Rmd / build_readme(): README stays plain markdown
• use_tidy_github_labels(): would rename labels and drop them from closed issues; deferred
• Aligning R/ and test file names: most tests are per-app and renaming would move _snaps/ folders
• use_codecov_badge(): no coverage workflow
• use_standalone("r-lib/rlang", "types-check"): keeping the checkmate-based helpers
• use_tidy_github_actions(): the repo uses rstudio/shiny-workflows
• expect_snapshot(error = TRUE): AppDriver errors include timestamps, ports, and paths, so patterns are used instead