fix(gui): Force newline in discussion entries to prevent squashed layout

- Insert imgui.new_line() before rendering discussion content.
- Ensures the Markdown renderer inherits the full horizontal width of the panel.
- Definitively fixes vertical squashing of tables and long text blocks.

tests/test_gui_v2_monolithic_width.py

@@ -0,0 +1,45 @@
+import unittest
+from unittest.mock import MagicMock, patch
+import sys
+import os
+
+# Ensure project root is in path
+project_root = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
+if project_root not in sys.path:
+ sys.path.insert(0, project_root)
+
+class TestMonolithicLayout(unittest.TestCase):
+ def test_render_discussion_entry_full_width_logic(self):
+  """Verify that render_discussion_entry uses full width and a newline."""
+  with patch('src.gui_2.imgui') as mock_imgui, \
+       patch('src.gui_2.imscope') as mock_imscope, \
+       patch('src.gui_2.theme') as mock_theme, \
+       patch('src.gui_2.project_manager') as mock_pm, \
+       patch('src.gui_2.render_thinking_trace') as mock_rtt, \
+       patch('src.gui_2.render_discussion_entry_read_mode') as mock_rderm:
+
+   expected_width = 850.0
+   mock_avail = MagicMock()
+   mock_avail.x = expected_width
+   mock_imgui.get_content_region_avail.return_value = mock_avail
+   mock_imgui.ImVec2.side_effect = lambda x, y: (x, y)
+
+   mock_app = MagicMock()
+   mock_app.disc_roles = ["User", "Assistant"]
+   entry = {"role": "User", "content": "test", "collapsed": False, "read_mode": False}
+
+   mock_imgui.begin_combo.return_value = False
+   mock_imgui.button.return_value = False
+   mock_imgui.input_text_multiline.return_value = (False, "test")
+
+   from src.gui_2 import render_discussion_entry
+   render_discussion_entry(mock_app, entry, 0)
+
+   # 1. Verify group expansion
+   mock_imgui.dummy.assert_any_call((expected_width, 0.0))
+   
+   # 2. Verify newline to prevent squashing
+   assert mock_imgui.new_line.called, "imgui.new_line() was not called to prevent squashing"
+
+if __name__ == '__main__':
+ unittest.main()