feat/ Add cell wrapping to fit column width

[kibi2]

Summary

This PR introduces cell content wrapping based on column width.

When a cell's content exceeds the available column width, it is now split into multiple lines so that it fits within the column constraints. This enables proper multi-line rendering of table cells.

Details

• Implemented wrapping logic for cell content
• Ensures each line does not exceed the specified column width
• Supports multi-byte characters correctly

Motivation

Previously, long cell content could overflow or break layout assumptions. With this change, table rendering becomes more robust and visually consistent, especially when column widths are constrained.

Notes

• This change mainly affects rendering behavior
• No breaking changes expected in external interfaces

[codecov]

Codecov Report

❌ Patch coverage is 97.23320% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lua/tirenvi/core/blocks.lua	92.00%	2 Missing ⚠️
lua/tirenvi/core/cell.lua	94.44%	2 Missing ⚠️
lua/tirenvi/core/attr.lua	90.90%	1 Missing ⚠️
lua/tirenvi/core/block.lua	98.30%	1 Missing ⚠️
lua/tirenvi/core/repair.lua	95.23%	1 Missing ⚠️

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