[rundel]

Progress mode's spinner only advanced when an item finished, and the cli progress bar could not use more than one line.

• The progress display is now drawn by ghclass rather than cli::cli_progress_bar(). Frames are signaled as message conditions and written to cli's output connection, so suppressMessages() silences them and they interleave with cli alerts. The bar still waits for cli.progress_show_after.
• curl's progress callback redraws the display while API requests wait (about once a second when idle, more often during transfers). For gh calls this goes through httr2's mock hook since httr2 has no global way to add curl options; GraphQL and raw downloads use httr::config(). Downloads via .destfile skip the hook because the mock cannot see the download path.
• Layout follows cli::console_width(). When the console is too narrow for the bar and the latest message to share a line, ANSI terminals show the message on a second line; non-ANSI consoles such as RStudio keep one line and truncate the message.
• ghclass_api_v3_req() now muffles gh's messages selectively instead of using suppressMessages(), so frames drawn mid-request still reach the terminal.
• Adds httr2 to Imports, updates with_progress() docs, and replaces the terminal test helper with a small escape-sequence replay used by new layout and hook tests.

Local git operations via gert have no callback, so the spinner pauses during clones and pushes.