Remove autoscroll behavior in spreadsheet mode

[Copilot]

Autoscrolling during question processing in spreadsheet mode proved distracting in practice.

Changes

• Removed automatic scroll trigger in SpreadsheetView.update_cell() when cells enter WORKING state
• Preserved _auto_scroll_to_row() method for explicit user interactions (e.g., select_row())

# Before: Autoscrolled to working cell
def update_cell(self, row_index, state, answer=None, agent_name=None):
    # ...update cell state...
    if state == CellState.WORKING:
        self._auto_scroll_to_row(row_index)  # Removed

# After: No automatic scrolling during processing
def update_cell(self, row_index, state, answer=None, agent_name=None):
    # ...update cell state...
    # User can still manually select rows to scroll

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove autoscroll behavior when questions are answered</issue_title>
<issue_description>Right now the view is autoscrolling when questions are answered in spreadsheet mode. This was in the original spec but it has proven to be distracting - so this autoscrolling behavior should be removed.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove autoscroll behavior when questions are answered #69

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