remove: old scrollbox-tabbar.org (all prose distributed to per-module orgs)

The combined org file had no unique content — all prose and code were
already in scrollbox.org, tabbar.org, and container-package.org. The
old file's code blocks had the pre-bugfix render/draw-scrollbars
versions and all had :tangle no.

Also update README.org and ARCHITECTURE.org references from
scrollbox-tabbar.org to the individual org files.

README.org

@@ -207,7 +207,7 @@ line joining on backspace. See ~org/text-input.org~.
 
 Scrollable viewport with a list of children. Only renders children
 intersecting the visible area (viewport culling). Scrollbars drawn
-at the right/bottom edges. See ~org/scrollbox-tabbar.org~.
+at the right/bottom edges. See ~org/scrollbox.org~.
 
 #+BEGIN_SRC lisp
 (make-scroll-box &key children scroll-y scroll-x sticky-scroll-p)
@@ -217,7 +217,7 @@ at the right/bottom edges. See ~org/scrollbox-tabbar.org~.
 *** TabBar
 
 Horizontal tab navigation. Renders tab labels, highlights active tab.
-Left/right arrows cycle through tabs. See ~org/scrollbox-tabbar.org~.
+Left/right arrows cycle through tabs. See ~org/tabbar.org~.
 
 #+BEGIN_SRC lisp
 (make-tab-bar &key tabs active)
@@ -356,7 +356,9 @@ cl-tty/
 ├── tests/                  # Test files
 ├── org/                    # Literate source files
 │   ├── text-input.org
-│   ├── scrollbox-tabbar.org
+│   ├── scrollbox.org
+│   ├── tabbar.org
+│   ├── container-package.org
 │   ├── dialog.org
 │   ├── mouse.org
 │   ├── select.org

docs/ARCHITECTURE.org

@@ -285,7 +285,9 @@ reads terminal background color at startup.
   │   ├── markdown-renderer.org
   │   ├── modern-backend.org
   │   ├── mouse.org
-  │   ├── scrollbox-tabbar.org
+  │   ├── scrollbox.org
+  │   ├── tabbar.org
+  │   ├── container-package.org
   │   ├── select.org
   │   ├── slot.org
   │   └── text-input.org

org/scrollbox-tabbar.org

@@ -1,455 +0,0 @@
-#+TITLE: ScrollBox + TabBar — Archived Combined Module
-#+STARTUP: content
-#+FILETAGS: :cl-tty:container:
-
-* NOTE: This file is an archive
-
-This org file was the original combined module for ScrollBox, TabBar,
-and the container package. It has been split into three separate org
-files (one per tangle target):
-
-- ~org/scrollbox.org~ — ScrollBox class, render, scrollbars (tangles
-  ~src/components/scrollbox.lisp~ and ~tests/scrollbox-tabbar-tests.lisp~)
-- ~org/tabbar.org~ — TabBar class, navigation, render (tangles
-  ~src/components/tabbar.lisp~)
-- ~org/container-package.org~ — Package definition (tangles
-  ~src/components/container-package.lisp~)
-
-All code blocks below are preserved for historical/documentation
-reference only and have ~:tangle no~. Do not modify this file;
-edit the individual org files above instead.
-
-* ScrollBox and TabBar
-
-Container components. ScrollBox handles content larger than the viewport,
-providing scroll offsets, viewport culling, and scrollbars. TabBar
-handles horizontal tab navigation with keyboard support.
-
-Both components inherit ~dirty-mixin~ and implement the component protocol
-(~render~, ~component-children~, ~component-layout-node~) so they work
-with the rendering pipeline and layout engine.
-
-** Contract
-
-ScrollBox:
-
-~(scroll-box &key scroll-y scroll-x width height children)~ → scroll-box
-  Create a ScrollBox container. CHILDREN is a list of components.
-  ~scroll-y~ and ~scroll-x~ are the scroll offsets in lines.
-
-~(scroll-box-children sb)~ → list of child components
-~(scroll-box-scroll-y sb)~ / ~(setf scroll-box-scroll-y)~
-~(scroll-box-scroll-x sb)~ / ~(setf scroll-box-scroll-x)~
-
-~(render ((sb scroll-box) backend))~ — renders visible children with
-  scroll offset applied, then draws scrollbars if content overflows.
-
-~(scroll-by sb dy dx)~ — adjust scroll offset by DY rows, DX columns.
-  Clamps to valid range (0 to content-size minus viewport-size).
-
-~(sticky-scroll-p sb)~ / ~(setf sticky-scroll-p)~ — when T, auto-scroll
-  to bottom when new content arrives.
-
-TabBar:
-
-~(tab-bar &key tabs active-tab)~ → tab-bar
-  TABS is a list of ~(id title)~ plists.
-
-~(tab-bar-active sb)~ / ~(setf tab-bar-active)~ — currently active tab id.
-~(tab-bar-tabs tb)~ — list of tab plists.
-~(tab-bar-add tb id title)~ — add a tab. Returns the tab id.
-
-~(render ((tb tab-bar) backend))~ — renders tab row, active tab
-  highlighted, inactive tabs dimmed.
-
-* Implementation
-
-** Package
-
-#+BEGIN_SRC lisp :tangle no
-(defpackage :cl-tty.container
-  (:use :cl :cl-tty.backend :cl-tty.box :cl-tty.layout :cl-tty.input)
-  (:export
-   ;; ScrollBox
-   #:scroll-box #:make-scroll-box
-   #:scroll-box-scroll-y #:scroll-box-scroll-x
-   #:scroll-box-children
-   #:scroll-by #:sticky-scroll-p
-   #:clamp-scroll
-   ;; TabBar
-   #:tab-bar #:make-tab-bar
-   #:tab-bar-active #:tab-bar-tabs
-   #:tab-bar-add #:tab-bar-next #:tab-bar-prev
-   #:tab-bar-select #:tab-bar-handle-key
-   ;; Rendering
-   #:render))
-#+END_SRC
-
-** ScrollBox class
-
-~scroll-box~ inherits from ~dirty-mixin~ for dirty tracking. It holds a
-list of child components and two scroll offset slots (~scroll-y~ and
-~scroll-x~). The ~sticky-scroll-p~ flag, when true, keeps the scroll
-position at the bottom whenever new children are added.
-
-The constructor accepts keyword arguments for initial offset and children.
-~children~ defaults to an empty list.
-
-#+BEGIN_SRC lisp :tangle no
-(in-package #:cl-tty.container)
-
-(defclass scroll-box (dirty-mixin)
-  ((children :initform nil :initarg :children
-             :accessor scroll-box-children :type list)
-   (scroll-y :initform 0 :initarg :scroll-y
-             :accessor scroll-box-scroll-y :type fixnum)
-   (scroll-x :initform 0 :initarg :scroll-x
-             :accessor scroll-box-scroll-x :type fixnum)
-   (sticky-scroll-p :initform t :initarg :sticky-scroll-p
-                    :accessor sticky-scroll-p :type boolean)
-   (layout-node :initform (make-layout-node) :accessor scroll-box-layout-node)))
-
-(defun make-scroll-box (&key (children nil) (scroll-y 0) (scroll-x 0)
-                          sticky-scroll-p)
-  (make-instance 'scroll-box
-    :children children
-    :scroll-y scroll-y
-    :scroll-x scroll-x
-    :sticky-scroll-p (if (null sticky-scroll-p) t sticky-scroll-p)))
-#+END_SRC
-
-** ScrollBox: component protocol
-
-~component-children~ returns the child list for the rendering pipeline
-to traverse. ~component-layout-node~ returns the layout node so the
-layout engine can position the ScrollBox itself.
-
-#+BEGIN_SRC lisp :tangle no
-(defmethod component-children ((sb scroll-box))
-  (scroll-box-children sb))
-
-(defmethod component-layout-node ((sb scroll-box))
-  (scroll-box-layout-node sb))
-#+END_SRC
-
-** ScrollBox: scroll-by
-
-~scroll-by~ adjusts the scroll offset by delta rows and columns. It
-clamps the offset so it doesn't go below 0 (no scroll before start)
-or beyond the content size minus the viewport size.
-
-~clamp-scroll~ recalculates valid bounds after content or viewport
-changes — called automatically when children change or the layout
-node resizes.
-
-#+BEGIN_SRC lisp :tangle no
-(defun clamp-scroll (sb)
-  "Clamp scroll offsets to valid range."
-  (let* ((ln (scroll-box-layout-node sb))
-         (viewport-height (if ln (layout-node-height ln) 0))
-         (viewport-width  (if ln (layout-node-width ln) 0))
-         (content-height (scroll-box-content-height sb))
-         (content-width  (scroll-box-content-width sb)))
-    (setf (scroll-box-scroll-y sb)
-          (max 0 (min (scroll-box-scroll-y sb)
-                      (- content-height viewport-height))))
-    (setf (scroll-box-scroll-x sb)
-          (max 0 (min (scroll-box-scroll-x sb)
-                      (- content-width viewport-width))))))
-
-(defun scroll-by (sb dy dx)
-  "Scroll by DY rows and DX columns. Clamps to valid range."
-  (incf (scroll-box-scroll-y sb) dy)
-  (incf (scroll-box-scroll-x sb) dx)
-  (clamp-scroll sb)
-  (mark-dirty sb))
-#+END_SRC
-
-** ScrollBox: content size estimation
-
-~scroll-box-content-height~ and ~scroll-box-content-width~ calculate
-the total content size by summing child layout node dimensions. This
-is used by ~clamp-scroll~ and scrollbar rendering.
-
-For height: sum of all child heights (vertical layout).
-For width: max of all child widths (horizontal scroll).
-
-#+BEGIN_SRC lisp :tangle no
-(defun scroll-box-content-height (sb)
-  "Total height of all children."
-  (reduce #'+ (scroll-box-children sb)
-          :key (lambda (c)
-                 (let ((ln (component-layout-node c)))
-                   (if ln (max 1 (layout-node-height ln)) 1)))
-          :initial-value 0))
-
-(defun scroll-box-content-width (sb)
-  "Maximum width among children."
-  (reduce #'max (scroll-box-children sb)
-          :key (lambda (c)
-                 (let ((ln (component-layout-node c)))
-                   (if ln (max 1 (layout-node-width ln)) 1)))
-          :initial-value 0))
-#+END_SRC
-
-** ScrollBox: rendering with viewport culling
-
-~render~ iterates children, computes each child's position within
-the viewport (adjusted for scroll offset), and only renders children
-whose visible area intersects the viewport. This is the core
-optimization — for a terminal with 200 children, only the ~24
-visible ones are actually drawn.
-
-~sticky-scroll~ when enabled and the view is at the bottom, keeps
-it at the bottom after content changes. The flag resets to false
-when the user manually scrolls up.
-
-#+BEGIN_SRC lisp :tangle no
-(defmethod render ((sb scroll-box) backend)
-  "Render visible children with scroll offset applied.
-Delegates to each child's `render` method, temporarily offsetting
-its layout-node position for the scroll offset. Children outside
-the viewport are clipped out."
-  (let* ((ln (scroll-box-layout-node sb))
-         (vx 0) (vy 0)
-         (vw (if ln (layout-node-width ln) 80))
-         (vh (if ln (layout-node-height ln) 24))
-         (sy (scroll-box-scroll-y sb))
-         (sx (scroll-box-scroll-x sb)))
-    (dolist (child (scroll-box-children sb))
-      (let* ((cln (component-layout-node child))
-             (ch (if cln (layout-node-height cln) 1))
-             (cy vy))
-        ;; Only render children that are visible in the viewport
-        (when (and (< (+ cy (- sy)) (+ vh vy))
-                   (> (+ cy (- sy) ch) vy))
-          ;; Temporarily offset child's layout-node position for rendering
-          (let ((orig-x (if cln (layout-node-x cln) 0))
-                (orig-y (if cln (layout-node-y cln) 0)))
-            (when cln
-              (setf (layout-node-x cln) (- orig-x sx)
-                    (layout-node-y cln) (- orig-y sy)))
-            (unwind-protect
-                 (render child backend)
-              (when cln
-                (setf (layout-node-x cln) orig-x
-                      (layout-node-y cln) orig-y)))))
-        (incf vy ch)))
-    (draw-scrollbars sb backend vw vh)))
-#+END_SRC
-
-** ScrollBox: sticky scroll
-
-~sticky-scroll~ checks whether the view is at the bottom. If so,
-auto-scrolls to keep the bottommost content visible. The user
-calling ~scroll-by~ with a negative DY resets the sticky flag.
-
-#+BEGIN_SRC lisp :tangle no
-(defun update-sticky-scroll (sb)
-  "If sticky-scroll-p is active and at bottom, keep at bottom."
-  (when (sticky-scroll-p sb)
-    (let* ((content-h (scroll-box-content-height sb))
-           (ln (scroll-box-layout-node sb))
-           (viewport-h (if ln (layout-node-height ln) 24)))
-      (when (>= (scroll-box-scroll-y sb) (- content-h viewport-h 1))
-        (setf (scroll-box-scroll-y sb)
-              (max 0 (- content-h viewport-h)))))))
-#+END_SRC
-
-** ScrollBox: scrollbar rendering
-
-~draw-scrollbars~ renders vertical and horizontal scrollbars as
-single-character-wide bars on the right and bottom edges of the
-viewport. The scrollbar thumb position and size reflect the current
-scroll position relative to content size.
-
-Vertical scrollbar: blocks (~#\\Full~ ~#\\Up~ ~#\\Mid~ ~#\\Down~).
-Horizontal scrollbar: block characters along the bottom.
-
-#+BEGIN_SRC lisp :tangle no
-(defun scrollbar-thumb (scroll-pos viewport-size content-size)
-  "Return the thumb position for a scrollbar (0.0 to 1.0)."
-  (if (> content-size viewport-size)
-      (/ (float scroll-pos) (- content-size viewport-size))
-      0.0))
-
-(defun draw-scrollbars (sb backend viewport-w viewport-h)
-  "Draw scrollbars if content exceeds viewport."
-  (let* ((content-h (scroll-box-content-height sb))
-         (content-w (scroll-box-content-width sb))
-         (sy (scroll-box-scroll-y sb))
-         (sx (scroll-box-scroll-x sb)))
-    ;; Vertical scrollbar
-    (when (> content-h viewport-h)
-      (let* ((thumb (scrollbar-thumb sy viewport-h content-h))
-             (thumb-pos (round (* thumb viewport-h))))
-        (draw-rect backend (1- viewport-w) 0 1 viewport-h :bg :scrollbar-bg)
-        (draw-text backend (1- viewport-w) thumb-pos "█" nil nil)))
-    ;; Horizontal scrollbar
-    (when (> content-w viewport-w)
-      (let* ((thumb (scrollbar-thumb sx viewport-w content-w))
-             (thumb-pos (round (* thumb viewport-w))))
-        (draw-rect backend 0 (1- viewport-h) viewport-w 1 :bg :scrollbar-bg)
-        (draw-text backend thumb-pos (1- viewport-h) "█" nil nil)))))
-#+END_SRC
-
-** TabBar class
-
-~tab-bar~ stores a list of tab plists ~((:id :tab1 :title "One") ...)~
-and the currently active tab id. ~tab-bar-add~ creates a new tab with
-the given id and title, returns the id.
-
-#+BEGIN_SRC lisp :tangle no
-(in-package #:cl-tty.container)
-
-(defclass tab-bar (dirty-mixin)
-  ((tabs :initform nil :initarg :tabs
-         :accessor tab-bar-tabs :type list)
-   (active :initform nil :initarg :active
-           :accessor tab-bar-active)
-   (layout-node :initform (make-layout-node) :accessor tab-bar-layout-node)
-   (focusable :initform t :accessor tab-bar-focusable)))
-
-(defun make-tab-bar (&key tabs active)
-  (make-instance 'tab-bar :tabs (or tabs nil) :active active))
-
-(defun tab-bar-add (tb id title)
-  "Add a tab with ID and TITLE. Sets as active if first tab."
-  (setf (tab-bar-tabs tb)
-        (nconc (tab-bar-tabs tb) (list (list :id id :title title))))
-  (unless (tab-bar-active tb)
-    (setf (tab-bar-active tb) id))
-  id)
-#+END_SRC
-
-** TabBar: component protocol
-
-#+BEGIN_SRC lisp :tangle no
-(defmethod component-layout-node ((tb tab-bar))
-  (tab-bar-layout-node tb))
-#+END_SRC
-
-** TabBar: navigation
-
-~tab-bar-next~ and ~tab-bar-prev~ cycle through tabs. ~tab-bar-select~
-activates a tab by id. ~tab-bar-handle-key~ dispatches key events
-(Left/Right to navigate, optional Enter to select).
-
-#+BEGIN_SRC lisp :tangle no
-(defun tab-bar-next (tb)
-  "Move to next tab."
-  (let* ((tabs (tab-bar-tabs tb))
-         (current (tab-bar-active tb))
-         (ids (mapcar (lambda (tab) (getf tab :id)) tabs))
-         (pos (position current ids)))
-    (when pos
-      (let ((next (nth (mod (1+ pos) (length ids)) ids)))
-        (setf (tab-bar-active tb) next)
-        (mark-dirty tb)))))
-
-(defun tab-bar-prev (tb)
-  "Move to previous tab."
-  (let* ((tabs (tab-bar-tabs tb))
-         (current (tab-bar-active tb))
-         (ids (mapcar (lambda (tab) (getf tab :id)) tabs))
-         (pos (position current ids)))
-    (when pos
-      (let ((prev (nth (mod (1- pos) (length ids)) ids)))
-        (setf (tab-bar-active tb) prev)
-        (mark-dirty tb)))))
-
-(defun tab-bar-select (tb id)
-  "Select a tab by ID."
-  (setf (tab-bar-active tb) id)
-  (mark-dirty tb))
-#+END_SRC
-
-** TabBar: keyboard handler
-
-~tab-bar-handle-key~ dispatches Left → previous tab, Right → next tab.
-Returns T if the key was handled, NIL otherwise (for composability with
-the keybinding system).
-
-#+BEGIN_SRC lisp :tangle no
-(defun tab-bar-handle-key (tb event)
-  "Handle a key-event on a TabBar. Returns T if handled."
-  (case (key-event-key event)
-    (:left (tab-bar-prev tb) t)
-    (:right (tab-bar-next tb) t)
-    (t nil)))
-#+END_SRC
-
-** TabBar: rendering
-
-~render~ iterates tabs, drawing each as ~[ Title ]~ with the active
-tab highlighted (bold, accent color) and inactive tabs dimmed. Tabs
-are separated by two spaces.
-
-The available width comes from the layout node. If tabs overflow,
-they are truncated with an ellipsis.
-
-#+BEGIN_SRC lisp :tangle no
-(defmethod render ((tb tab-bar) backend)
-  (let* ((ln (tab-bar-layout-node tb))
-         (x (if ln (layout-node-x ln) 0))
-         (y (if ln (layout-node-y ln) 0))
-         (w (if ln (layout-node-width ln) 80))
-         (active-id (tab-bar-active tb))
-         (tabs (tab-bar-tabs tb))
-         (x-pos x))
-    (dolist (tab tabs)
-      (let* ((id (getf tab :id))
-             (title (getf tab :title))
-             (label (format nil " ~A " title))
-             (label-len (length label))
-             (is-active (eql id active-id))
-             (fg (if is-active :accent :text-muted))
-             (bg (if is-active :background-element nil)))
-        ;; Check if tab fits
-        (when (>= (+ x-pos label-len 2) (+ x w))
-          (draw-text backend x-pos y "..." :text-muted nil)
-          (return))
-        ;; Draw tab
-        (draw-text backend x-pos y label fg bg)
-        (incf x-pos (+ label-len 2))))
-    (values)))
-#+END_SRC
-
-** Bug Fixes (v1.0.0): scroll offset and scrollbar position
-
-Two bugs were fixed in the ScrollBox render pipeline:
-
-1. *Render scroll origin*: The render method used ~orig-y~ (the child's original
-   layout-node Y position, always 0 for top-level children) as the basis for
-   scroll offset.  This caused the content-relative position ~vy~ to be ignored,
-   making scroll offsets incorrect when children were offset by layout.
-
-   Fix: Use ~vy~ (the content-relative Y accumulator) instead of ~orig-y~ when
-   setting the temporary layout offset: ~(layout-node-y cln) (- vy sy)~.
-
-2. *Scrollbar positions*: ~draw-scrollbars~ drew scrollbars at viewport-local
-   coordinates (0, 0), not accounting for the scrollbox's own position within
-   the layout tree.  Scrollbars would appear at the wrong screen location when
-   the scrollbox was nested inside other containers.
-
-   Fix: Read the scrollbox's layout-node origin ~(ox, oy)~ and offset all
-   scrollbar drawing coordinates by those values.
-
-* Tests
-
-#+BEGIN_SRC lisp :tangle no
-(defpackage :cl-tty-scrollbox-test
-  (:use :cl :fiveam :cl-tty.backend :cl-tty.box :cl-tty.layout :cl-tty.input :cl-tty.container)
-  (:export #:run-tests))
-(in-package #:cl-tty-scrollbox-test)
-
-(def-suite scrollbox-suite :description "ScrollBox + TabBar tests")
-(in-suite scrollbox-suite)
-
-(defun run-tests ()
-  (let ((result (run 'scrollbox-suite)))
-    (fiveam:explain! result)
-    (uiop:quit 0)))
-
-;; ScrollBox tests omitted here — see org/scrollbox.org
-#+END_SRC