v0.7.2: HITL panel collapse on approve/deny — TDD

resolve-hitl-panel marks the most recent panel message with
:panel-resolved (:approved or :denied) and writes back to
the message vector. View-chat renders resolved panels with
dimmed color instead of :hitl theme color.

/approve and /deny handlers call resolve-hitl-panel after
sending structured events to the daemon. Confirmation messages
now use checkmark/crossmark prefixes.

- channel-tui-main: resolve-hitl-panel fn, wired into handlers
- channel-tui-view: is-resolved check for panel dimming
- +2 tests: panel-after-approve, panel-after-deny
- TUI Main: 88/89 (1 pre-existing flake)

lisp/channel-tui-view.lisp

@@ -85,11 +85,14 @@ Returns list of trimmed strings. Single words wider than width are split."
                         (color (theme-color (case role (:user :user) (:agent :agent) (:system :system) (t :agent))))
                         (prefix (case role (:user "⬆") (:agent "⬇") (t "  ")))
                         (is-panel (getf msg :panel))
+                        (is-resolved (getf msg :panel-resolved))
                         (line-text (format nil "~a [~a] ~a" prefix time content))
                         (wrapped (word-wrap line-text (- w 2))))
                    ;; HITL panel: render with colored border
                    (when is-panel
-                     (setf color (theme-color :hitl)))
+                     (setf color (if is-resolved
+                                    (theme-color :dim)
+                                    (theme-color :hitl))))
                    (dolist (line wrapped)
                       (when (< y (1- h))
                         (if (eq role :agent)