T39: a session's row shows its status, the most pressing first: waiting by its kind, an error, work with Ely's progress ring or a still loader, done, then a failed last command, then idle; hover lists each record's state, app, title and message, disarmed and cut; typing sees done and error, herdr's aside; a hidden session that starts waiting sets its title strong until shown

README.md

@@ -43,7 +43,7 @@ The app writes its log to stderr. `RUST_LOG=elyterminal=debug` writes more; `tra
 
 - The terminal runs on `alacritty_terminal`: 256 colors and truecolor, bold, dim, italic, five underline styles, wide characters and combining marks. Box drawing, block elements and powerline shapes are drawn as geometry, so lines join across cells. Keys follow xterm and the kitty keyboard protocol; input methods compose at the cursor; programs can track the mouse; pastes are bracketed when a program asks; OSC 8 and plain links open with the link press below; find searches the scrollback.
 - Shell integration for zsh, bash, fish and PowerShell: each prompt reports its folder and title, and OSC 133 marks each prompt, each command and its exit status.
-- Sessions: new, close and switch. A bell marks a hidden session's row and makes no sound.
+- Sessions: new, close and switch. A bell marks a hidden session's row and makes no sound. A row's mark shows what its programs report through OSC 7501, OSC 9;4 or herdr: waiting on you, an error, work with its progress, done or idle, else a failed last command; hover over the mark lists each report.
 - Cmd-Up and Cmd-Down, Ctrl-Shift-Up and Ctrl-Shift-Down off macOS, jump to the prompt before or after the view's top.
 - A button at each end of the title bar hides or shows its side column, and a drag on the border between a side column and the terminal resizes it; the window opens as it was left, at the size and widths it was left at. On Windows and Linux a gear beside the right one opens Settings.
 - Files shows the session's folder as a tree with Git's marks. Inside herdr the folder is that of herdr's focused pane.