Add width_percent and height_percent optional inputs to tile functions

[Copilot]

This PR adds convenient width_percent and height_percent parameters to all TileMaker tile functions, addressing common flexdashboard layout challenges.

Problem

Previously, users had to manually write CSS style strings to control tile dimensions:

# Old way - manual CSS
solo_box(value = 100, txt = "Sales", style = "width: 32%; height: 80%;")

This was especially problematic in flexdashboard setups where:

• height_percent is needed when button text wrapping makes rows uneven
• width_percent is needed to make buttons fill rows equally (e.g., 3 buttons at 32% width each)

Solution

Added optional width_percent and height_percent parameters to all tile functions:

• solo_box()
• solo_gradient_box()
• solo_box_ct()
• multi_box()

Usage

# New way - simple percentage parameters
solo_box(value = 100, txt = "Sales", width_percent = 32, height_percent = 80)

# Three equal-width buttons filling a row
solo_box(value = 100, txt = "Sales", width_percent = 32)
solo_box(value = 85, txt = "Marketing", width_percent = 32)  
solo_box(value = 92, txt = "Support", width_percent = 32)

# Control height when text wrapping affects layout
solo_box(value = 150, txt = "Long descriptive text", height_percent = 90)

# Flexible input - accepts numbers or strings with %
solo_box(value = 42, txt = "Test", width_percent = 50)      # number
solo_box(value = 42, txt = "Test", width_percent = "50%")   # string

Implementation Details

• Automatically generates CSS width and height properties
• Handles both numeric (50) and string ("50%") input formats
• Combines properly with existing styling (cursor pointer for links)
• Maintains full backward compatibility
• Comprehensive test coverage for all functions and scenarios

Fixes #19.

Warning

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If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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