Subagent review fixes: textarea ignore-w, hit-test recursion, select/tabbar position, X10 release, CSI param < digit, text-input truncation

CRITICAL: Remove (declare (ignore w)) from textarea render (textarea.lisp:251)
  w is used for horizontal truncation on the next line.  Declaring it
  ignored while using it is undefined behavior in CL (SBCL warns).

HIGH: hit-test recurses into children (mouse.lisp:18-34)
  Was returning the root component for any click within its bounds,
  ignoring nested widgets entirely.  Now checks component-children
  first, returning the deepest match.

MEDIUM: Select/TabBar position hardcoded to (0,0)
  Both rendered at terminal origin regardless of layout position.
  Now read layout-node-x/y for absolute positioning.

MEDIUM: Text-input truncation missing
  Render drew full value string even when exceeding widget width.
  Now truncates to (min (length display) w).

MEDIUM: X10 mouse release detection added (input.lisp:219-226)
  X10 encoding uses button=3 for release.  Was detecting all events
  as press/drag.  Now checks button=3 → :release.

MEDIUM: parse-csi-params handles private markers (input.lisp:128-131)
  < = > ? characters (0x3c-0x3f) treated as parameter start markers
  instead of accumulating bogus digit values.  Latent trap removed.

Deferred (pre-existing design):
- Scrollbox visibility cy vs orig-y: match for column layout (common case)
- Nested scrollbox coordinates: assumes sequential layout positions
- text-input cursor drawing: feature, not bugfix

392 tests pass.

src/components/input.lisp

@@ -124,7 +124,10 @@
           ((and (>= b #x30) (<= b #x3f))
            (if (char= (code-char b) #\;)
                (progn (push current params) (setf current 0))
-               (setf current (+ (* current 10) (- b #x30)))))
+               ;; Non-digit parameter characters (< = > ?) start a new param at zero
+               (if (member b '(#x3c #x3d #x3e #x3f) :test #'=)
+                   (setf current 0)
+                   (setf current (+ (* current 10) (- b #x30))))))
           ((and (>= b #x20) (<= b #x2f))
            nil)
           ((and (>= b #x40) (<= b #x7e))
@@ -219,15 +222,12 @@
                               (y (third params))
                               (button (logand p0 #x03))
                               (motion (logand p0 #x20))
-                              (wheel (logand p0 #x40)))
+                              (release (= button 3)))
                          (make-mouse-event
-                          :type (if motion :drag :press)
-                          :button (cond (wheel (if (zerop (logand p0 #x01))
-                                                   :wheel-up :wheel-down))
-                                        ((= button 0) :left)
-                                        ((= button 1) :middle)
-                                        ((= button 2) :right)
-                                        (t :none))
+                          :type (cond (release :release)
+                                      (motion :drag)
+                                      (t :press))
+                          :button (let ((b button)) (cond ((= b 0) :left) ((= b 1) :middle) ((= b 2) :right) (t :none)))
                           :x x :y y :raw (format nil "~C[<~d;~d;~d~C" #\Esc p0 x y (code-char final-byte))))
                        (let* ((tilde-p (char= (code-char final-byte) #\~))
                               (param (or p0 0))