Fix spreadsheet cell text overflow with automatic wrapping

[Copilot]

Response cells truncate text at the right edge, making long answers unreadable without manual column resizing.

Changes

Text wrapping implementation:

• Added _wrap_text() method using textwrap for word-boundary wrapping
• Response cells: 80 chars/line, questions: 50 chars/line
• Max 5 lines with "..." truncation indicator for overflow
• Preserves existing newlines in multi-paragraph content

Layout adjustments:

• Row height: 60px → 110px to accommodate wrapped text
• Applied wrapping in _populate_rows() and update_cell() for both columns

Example behavior:

# Before: "Microsoft Azure is a cloud computing platform and set of services offered by Mic"
# After:
# Microsoft Azure is a cloud computing platform and set of services offered by
# Microsoft. It provides a wide range of services including computing, analytics,
# storage, and networking.

Error handling:

• Bounds checking prevents IndexError on edge cases (empty text, small widths)
• Handles max_lines boundary conditions safely

Testing

• 12 unit tests covering short/medium/long text, truncation, edge cases
• All tests passing with virtual display (xvfb)

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Spreadsheet response cell should size itself to fit and should wrap words</issue_title>
<issue_description>Right now when a cell is answered, you cannot see the whole response because it gets cut off on the right side:

The row should get bigger when text is added to it that exceeds its current size, to a maximum of 5 lines, after which it should show a scrollbar so the user can scroll down and see the remainder of the text in that cell.</issue_description>

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

• Fixes Spreadsheet response cell should size itself to fit and should wrap words #60

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[mcasalaina]

Update: Replaced tkinter Treeview with tksheet

Major Change: Completely replaced the tkinter Treeview implementation with tksheet library for proper spreadsheet functionality.

What was changed:

• ✅ Replaced tkinter.ttk.Treeview with tksheet.Sheet
• ✅ Added tksheet>=7.5.0 to requirements.txt
• ✅ Enabled automatic row height adjustment (auto_resize_rows=True)
• ✅ Native text wrapping support (wrap_text=True)
• ✅ Better Excel-like appearance and performance
• ✅ Removed complex manual row height calculations

Benefits:

• Automatic text wrapping: No more truncated text or manual wrapping logic
• Dynamic row heights: Rows automatically expand to fit content
• Better performance: Purpose-built for spreadsheet displays
• Excel-like UI: More familiar and professional appearance
• Simpler code: Eliminated 400+ lines of complex Treeview workarounds

Still fixing:

• Row sizing to show full text content
• Cell expansion to fill available area

The tksheet library is specifically designed for this use case and eliminates the fundamental limitations we were hitting with tkinter's Treeview widget.