test(#654): pin the wrap walk for a soft-wrapped composer on a parked viewport

The parked-viewport test had no wrapped rows and the termination test runs at
baseY 0, so nothing pinned the walk of a multi-row composer through absolute
lines off the bottom. The new case fails on the pre-fix terminal-ui.js
('link' instead of 'history') and passes with the fix.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

test/terminal-touch-tap.test.ts

@@ -1116,6 +1116,30 @@ describe('terminal link tap', () => {
     expect(windowRef.open).toHaveBeenCalledWith('https://example.com/guide', '_blank', 'noopener,noreferrer');
   });
 
+  it('walks a soft-wrapped composer through absolute lines while the viewport is parked', () => {
+    // The composer spans absolute lines 2-3 (3 is its soft-wrapped tail, where the caret
+    // sits); the viewport is parked one row above the bottom, so screen row 1 is the
+    // composer's FIRST row and screen row 0 is scrollback.
+    const history = 'docs at https://example.com/guide';
+    const composer = '❯ summarize https://example.com/typed';
+    const lines = ['older', history, composer, ' for me', '', ''];
+    const { app, windowRef } = linkHarness(lines);
+    Object.assign(app.terminal, { rows: 3 });
+    Object.assign(app.terminal.buffer.active, { baseY: 3, viewportY: 1, cursorY: 0 });
+    const getLine = app.terminal.buffer.active.getLine;
+    app.terminal.buffer.active.getLine = (row: number) => {
+      const line = getLine(row);
+      return line && row === 3 ? { ...line, isWrapped: true } : line;
+    };
+
+    // The composer's first row is on the caret's logical line: its typed URL stays editable.
+    expect(app._handleMobileTerminalTap(at(composer.indexOf('https'), 1), true, 'history')).toBe('history');
+    expect(windowRef.open).not.toHaveBeenCalled();
+    // Screen row 0 is absolute line 1, scrollback: its URL opens.
+    expect(app._handleMobileTerminalTap(at(history.indexOf('https'), 0), true, 'history')).toBe('link');
+    expect(windowRef.open).toHaveBeenCalledWith('https://example.com/guide', '_blank', 'noopener,noreferrer');
+  });
+
   it('stops the caret-line wrap walk at the buffer end even when every row is wrapped', () => {
     // xterm's getLine indexes its circular list modulo capacity, so past the last row it
     // returns earlier rows again; with all of them soft-wrapped an unbounded walk never ends.