feat: forward touch swipe as mouse scroll events for full-screen TUI apps

When a full-screen TUI (e.g. Claude Code, vim, less) uses the alternate
screen buffer, UIScrollView has no scrollable content and
scrollViewDidScroll: never fires. This means touch swipe gestures are
silently dropped instead of reaching the remote program.

Changes:
- Add UIPanGestureRecognizer to detect vertical swipes independently of
  UIScrollView's scroll state
- Call exports.handleScrollDelta() from the pan gesture only, removing
  it from scrollViewDidScroll: to prevent spurious events on keyboard
  show/hide layout changes
- Add exports.handleScrollDelta() in term.js (from PR ish-app#2708) which
  dispatches synthetic WheelEvents into hterm's mouse pipeline; hterm
  forwards them as xterm mouse scroll sequences when mouse reporting is
  active or on the alternate screen

This enables touch scroll to work in tmux copy mode, allowing users to
scroll through conversation history in Claude Code and similar TUIs.

Author: Manho

app/TerminalView.h

@@ -14,7 +14,7 @@ enum OverrideAppearance {
     OverrideAppearanceDark,
 };
 
-@interface TerminalView : UIView <UITextInput, WKScriptMessageHandler, UIScrollViewDelegate>
+@interface TerminalView : UIView <UITextInput, WKScriptMessageHandler, UIScrollViewDelegate, UIGestureRecognizerDelegate>
 
 @property IBInspectable (nonatomic) BOOL canBecomeFirstResponder;
 

app/TerminalView.m

@@ -31,7 +31,9 @@ - (void)userContentController:(WKUserContentController *)userContentController d
 }
 @end
 
-@interface TerminalView ()
+@interface TerminalView () {
+    CGFloat _panLastY;
+}
 
 @property (nonatomic) NSMutableArray<UIKeyCommand *> *keyCommands;
 @property ScrollbarView *scrollbarView;
@@ -64,6 +66,12 @@ - (void)awakeFromNib {
     scrollbarView.bounces = NO;
     [self addSubview:scrollbarView];
 
+    // Pan gesture recognizer for forwarding scroll events when UIScrollView has no scrollable content
+    // (e.g. when a full-screen TUI like Claude Code or vim uses the alternate screen)
+    UIPanGestureRecognizer *panGR = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(_handleTUIScrollGesture:)];
+    panGR.delegate = self;
+    [scrollbarView addGestureRecognizer:panGR];
+
     UserPreferences *prefs = UserPreferences.shared;
     [prefs observe:@[@"capsLockMapping", @"optionMapping", @"backtickMapEscape", @"overrideControlSpace"]
            options:0 owner:self usingBlock:^(typeof(self) self) {
@@ -271,6 +279,28 @@ - (void)scrollViewDidScroll:(UIScrollView *)scrollView {
     [self.terminal.webView evaluateJavaScript:[NSString stringWithFormat:@"exports.newScrollTop(%f)", scrollView.contentOffset.y] completionHandler:nil];
 }
 
+// Allow our pan GR and UIScrollView's built-in pan GR to fire simultaneously
+- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)other {
+    return YES;
+}
+
+// Handles vertical swipe gestures when UIScrollView has no scrollable content (alternate screen TUI mode)
+- (void)_handleTUIScrollGesture:(UIPanGestureRecognizer *)gesture {
+    if (gesture.state == UIGestureRecognizerStateBegan) {
+        _panLastY = [gesture translationInView:self.scrollbarView].y;
+        return;
+    }
+    if (gesture.state != UIGestureRecognizerStateChanged) {
+        return;
+    }
+    CGFloat currentY = [gesture translationInView:self.scrollbarView].y;
+    CGFloat delta = currentY - _panLastY;
+    _panLastY = currentY;
+    if (delta != 0) {
+        [self.terminal.webView evaluateJavaScript:[NSString stringWithFormat:@"exports.handleScrollDelta(%f)", -delta] completionHandler:nil];
+    }
+}
+
 - (void)setKeyboardAppearance:(UIKeyboardAppearance)keyboardAppearance {
     BOOL needsFirstResponderDance = self.isFirstResponder && _keyboardAppearance != keyboardAppearance;
     if (needsFirstResponderDance) {

app/iSH.xcconfig

@@ -1,7 +1,7 @@
 // Change this to change all the bundle IDs and app groups
-ROOT_BUNDLE_IDENTIFIER = app.ish.iSH
+ROOT_BUNDLE_IDENTIFIER = com.manho.ish.iSH
 // It's easiest to specify your development team ID in the project build settings, but you can alternatively put it here to reduce merge conflicts
-DEVELOPMENT_TEAM =
+DEVELOPMENT_TEAM = H4X7357NQA
 
 // Choose logging channels to enable. Separate by spaces. Try "verbose strace".
 ISH_LOG =

app/terminal/term.js

@@ -156,6 +156,26 @@ exports.getCharacterSize = () => {
 exports.clearScrollback = () => term.clearScrollback();
 exports.setUserGesture = () => term.accessibilityReader_.hasUserGesture = true;
 
+// Forward scroll delta as synthetic WheelEvents into hterm's onMouse_ pipeline.
+let scrollDeltaRemainder = 0;
+exports.handleScrollDelta = (delta) => {
+  if (term.vt.mouseReport === term.vt.MOUSE_REPORT_DISABLED && term.isPrimaryScreen())
+    return;
+  const charH = term.scrollPort_.characterSize.height;
+  if (!charH) return;
+  scrollDeltaRemainder += delta;
+  const lines = Math.trunc(scrollDeltaRemainder / charH);
+  if (lines === 0) return;
+  scrollDeltaRemainder -= lines * charH;
+  for (let i = 0; i < Math.abs(lines); i++) {
+    term.scrollPort_.screen_.dispatchEvent(new WheelEvent('wheel', {
+      deltaY: lines > 0 ? 1 : -1,
+      deltaMode: WheelEvent.DOM_DELTA_LINE,
+      cancelable: true,
+    }));
+  }
+};
+
 hterm.openUrl = (url) => native.openLink(url);
 
 native.load();