fix(terminal): restore terminal text copy behavior (#452)

* fix(terminal): restore terminal text copy behavior

* fix(desktop): route Cmd+C through terminal-aware copy handler on macOS

- Use a custom macOS Copy menu action to dispatch app copy events first, so terminal selections copy without native “no target” beep, while preserving DOM copy fallback for non-terminal contexts.

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Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/index.css

@@ -888,11 +888,8 @@ html:not(.dark) .chat-scroll {
 /* Keep Ghostty's internal focus textarea fully non-painting on desktop. */
 .terminal-viewport-container textarea:not([data-terminal-hidden-input="true"]) {
   opacity: 0 !important;
-  width: 0 !important;
-  height: 0 !important;
   font-size: 0 !important;
   line-height: 0 !important;
-  clip-path: inset(100%) !important;
   color: transparent !important;
   -webkit-text-fill-color: transparent !important;
   background: transparent !important;
@@ -908,9 +905,6 @@ input[aria-label="Terminal input"] {
   color: transparent !important;
   -webkit-text-fill-color: transparent !important;
   opacity: 0 !important;
-  width: 0 !important;
-  height: 0 !important;
-  clip-path: inset(100%) !important;
   outline: none !important;
 }