fix: close defun on-key with missing paren, complete cl-tty TUI migration

- Added missing closing paren for defun on-key in org/channel-tui-main.org
  line 616 (was 7 trailing ), now 8)
- Replaced #\) character literal with (code-char 41) to avoid reader
  ambiguity with paren-delimiter counting
- All 3 TUI org files tangled and verified compilable
- passepartout/tui loads without errors under SBCL 2.5.2

lisp/channel-tui-state.lisp

@@ -1,5 +1,5 @@
 (defpackage :passepartout.channel-tui
-  (:use :cl :croatoan :passepartout :usocket :bordeaux-threads)
+  (:use :cl :passepartout :usocket :bordeaux-threads)
   (:export :tui-main :st :add-msg :now :input-string
            :queue-event :drain-queue :init-state
            :view-status :view-chat :view-input :redraw
@@ -101,8 +101,15 @@ See *tui-theme-presets* for named presets (dark, light, solarized, gruvbox).")
       key)))
 
 (defun theme-color (role)
-  "Returns the Croatoan color for a semantic role."
-  (or (getf *tui-theme* role) :white))
+  "Returns a hex color string for a semantic role, suitable for cl-tty."
+  (let ((val (or (getf *tui-theme* role) :white)))
+    (cond
+      ((stringp val) val)
+      (t (case val
+           (:green "#00FF00") (:red "#FF0000") (:cyan "#00FFFF")
+           (:yellow "#FFFF00") (:magenta "#FF00FF") (:blue "#0000FF")
+           (:white "#FFFFFF") (:black "#000000")
+           (t "#FFFFFF"))))))
 
 (defun st (key) (getf *state* key))
 (defun (setf st) (val key) (setf (getf *state* key) val))