fix: resolve TUI compilation errors, replace ST calls with GETF

- Remove dead croatoan-to-tty-event keymap dispatch clause from on-key
- Replace all (st :key) with (getf *state* :key) and all
  (setf (st :key) val) with (setf (getf *state* :key) val)
  to avoid SBCL cross-file SETF expander issues (239 replacements)
- Fix redraw arity: called with 4 args but defined with 3
- TUI now loads, initializes, and connects to daemon successfully

lisp/channel-tui-state.lisp

@@ -126,6 +126,9 @@ See *tui-theme-presets* for named presets (dark, light, solarized, gruvbox).")
               :collapsed-gates nil                          ; v0.7.2
               :search-mode nil :search-query ""           ; v0.7.2
               :search-matches nil :search-match-idx 0
+              :sidebar-visible nil                        ; v0.8.0
+              :expand-tool-calls nil                      ; v0.8.0
+              :mcp-count 0                                ; v0.8.0
               :dirty (list nil nil nil))))
 
 (defun now ()