Fix(🐛): Exception 'dict' object has no attribute 'split'

[waterbang]

Handle cases where sketch data from YAML is stored as dict instead of
string, preventing AttributeError when calling split() on dict objects.

Exception 'dict' object has no attribute 'split'

File "/Users/waterbang/.local/pipx/venvs/cccc-pair/lib/python3.14/site-packages/prompt_toolkit/key_binding/key_processor.py", line 273, in process_keys
    self._process_coroutine.send(key_press)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/Users/waterbang/.local/pipx/venvs/cccc-pair/lib/python3.14/site-packages/prompt_toolkit/key_binding/key_processor.py", line 188, in _process
    self._call_handler(matches[-1], key_sequence=buffer[:])
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/waterbang/.local/pipx/venvs/cccc-pair/lib/python3.14/site-packages/prompt_toolkit/key_binding/key_processor.py", line 323, in _call_handler
    handler.call(event)
    ~~~~~~~~~~~~^^^^^^^
  File "/Users/waterbang/.local/pipx/venvs/cccc-pair/lib/python3.14/site-packages/prompt_toolkit/key_binding/key_bindings.py", line 127, in call
    result = self.handler(event)
  File "/Users/waterbang/.local/pipx/venvs/cccc-pair/lib/python3.14/site-packages/prompt_toolkit/key_binding/bindings/mouse.py", line 275, in _
    return handler(
        MouseEvent(
    ...<4 lines>...
        )
    )
  File "/Users/waterbang/.local/pipx/venvs/cccc-pair/lib/python3.14/site-packages/prompt_toolkit/layout/containers.py", line 1846, in mouse_handler
    result = self.content.mouse_handler(
        MouseEvent(
    ...<4 lines>...
        )
    )
  File "/Users/waterbang/Desktop/waterbang/ai/wall-e/.cccc/tui_ptk/app.py", line 958, in custom_mouse_handler
    on_task_click()
    ~~~~~~~~~~~~~^^
  File "/Users/waterbang/Desktop/waterbang/ai/wall-e/.cccc/tui_ptk/app.py", line 2854, in on_task_click
    self._toggle_task_panel()
    ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Users/waterbang/Desktop/waterbang/ai/wall-e/.cccc/tui_ptk/app.py", line 3689, in _toggle_task_panel
    self._show_unified_detail_dialog()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Users/waterbang/Desktop/waterbang/ai/wall-e/.cccc/tui_ptk/app.py", line 3902, in _show_unified_detail_dialog
    text=get_content(),
         ~~~~~~~~~~~^^
  File "/Users/waterbang/Desktop/waterbang/ai/wall-e/.cccc/tui_ptk/app.py", line 3762, in get_content
    return self.task_panel.get_detail_view(width=dialog_width - 8)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/waterbang/Desktop/waterbang/ai/wall-e/.cccc/tui_ptk/task_panel.py", line 695, in get_detail_view
    content = self._render_sketch_content(INNER)
  File "/Users/waterbang/Desktop/waterbang/ai/wall-e/.cccc/tui_ptk/task_panel.py", line 902, in _render_sketch_content
    for line in sketch.split('\n'):
                ^^^^^^^^^^^^

Exception 'dict' object has no attribute 'split'
Press ENTER to continue...