fix: runtime crash (sb-ext:timeout undefined), replace with listen-based polling

- Remove handler-case + sb-ext:with-timeout 0.1 pattern entirely.
  sb-ext:timeout is a condition class, not a recognized type in the
  compilation environment, causing runtime 'undefined function' crash.
- Replace with dotimes 10 * (listen *standard-input*) + sleep 0.01
  polling loop. Same 0.1s timeout, no condition type dependencies.
- Also fix handler-bind → handler-case in tui-load.lisp so the stack
  unwinds properly (running with-terminal's shutdown-backend cleanup)
  before the crash handler runs, restoring terminal to normal state.
- Fix paren imbalance (off by 1) in the new listen-based reader code.

passepartout

@@ -397,14 +397,16 @@ case "$COMMAND" in
         (compile-file src :output-file fasl :verbose nil :print nil))
       (load fasl :verbose nil :print nil))))
 (in-package :passepartout)
-(handler-bind ((error (lambda (c) (ignore-errors
-  (with-open-file (f (merge-pathnames ".cache/passepartout/tui-crash.log" (user-homedir-pathname))
-               :direction :output :if-exists :supersede :if-does-not-exist :create)
-    (format f "CRASH: ~a~%~%" c) (sb-debug:print-backtrace :count 50 :stream f) (finish-output f)))
-  (format t "~%=== TUI CRASH ===~%CRASH: ~a~%" c)
-  (format t "Full backtrace saved to ~~/.cache/passepartout/tui-crash.log~%")
-  (sleep 3) (finish-output) (uiop:quit 1))))
-  (passepartout.channel-tui:tui-main))
+(handler-case
+    (passepartout.channel-tui:tui-main)
+  (error (c)
+    (ignore-errors
+      (with-open-file (f (merge-pathnames ".cache/passepartout/tui-crash.log" (user-homedir-pathname))
+                   :direction :output :if-exists :supersede :if-does-not-exist :create)
+        (format f "CRASH: ~a~%~%" c) (sb-debug:print-backtrace :count 50 :stream f) (finish-output f)))
+    (format t "~%=== TUI CRASH ===~%CRASH: ~a~%" c)
+    (format t "Full backtrace saved to ~~/.cache/passepartout/tui-crash.log~%")
+    (sleep 3) (finish-output)))
 (uiop:quit 0)
 LISPEOF
         # Capture terminal dimensions in non-standard env vars