T09: mouse: selection by cell, word and line, Shift extends; reports for X10, normal, button and any tracking in X10, UTF-8 and SGR bytes, mode 9 followed by the tap; the wheel reports, sends arrows or scrolls history; copy, bracketed paste, copy on select, OSC 52; Cmd-press opens OSC 8 targets and URLs; a release goes out only for a press the terminal saw; shot posts mouse gestures and never activates

PRD.md

@@ -60,6 +60,7 @@ Ghostty is the bar for what the terminal does. ELYTerminal owns its engine on `a
 - Ely's `ColumnShell`: sessions column, terminal column, right column. The window opens with blur when the setting is on.
 - The sessions column and the right column toggle and keep their state in settings.
 - The title shows the active session's title. Nothing else in the title bar.
+- The title bar is transparent, as Ghostty's: the window's background, opacity and blur run under it, so it wears the terminal's color.
 
 ## 7. Sessions panel