feat: add cyberpunk-style colored ASCII art banner with Sparkfabrik colors

[Copilot]

Implemented a modern, cyberpunk-inspired ASCII art banner for Sparkdock that replaces the simple monochrome text logo with a visually striking colored design featuring Sparkfabrik brand colors.

Changes Made

Visual Design

• Modern ASCII Art: Created a stylized "SPARKDOCK" logo using geometric block characters and Unicode symbols
• Cyberpunk Aesthetics: Added gradient borders with ░▒▓ characters for a futuristic appearance
• Color Scheme: Integrated Sparkfabrik colors with red as the primary color, complemented by cyan accents for cyberpunk contrast effects

Technical Implementation

• Enhanced the print_banner() function in bin/common/utils.sh to dynamically load advanced color libraries
• Leverages existing color system from sjust/libs/libcolors.sh and sjust/libs/libformatting.sh
• Implements intelligent fallback to basic terminal colors when advanced libraries are unavailable
• Fixed bash compatibility by removing ZSH-specific setopt command

Example Output

  ░▒▓█████████████████████████████████████▓▒░

     ▄█████▄ ▄█████▄  ▄█████▄ ▄█████▄ ██  ██ ▄█████▄
     █▄▄▄▄▄█ ████████ ████████ ████████ █████ ████████
     ██████▄ ████████ ████████ ████████ █████ ████████
     ▄▄▄▄▄██ ████▄▄▄▄ ████▄▄▄▄ ████▄▄▄▄ █████ ████▄▄▄▄
     █████▄▄ ████     ████     ████████ █████ ████

     ▄█████▄  ▄█████▄  ▄█████▄ ██  ██
     ████████ ████████ ████████ █████
     ████████ ████████ ████  ▄▄ █████
     ████  ▄▄ ████  ▄▄ ████ ▄██ █████
     ████  ▄▄ ████████ ▄█████▄ █████

  ░▒▓█████████████████████████████████████▓▒░

The banner maintains perfect integration with the existing "System Information" section while providing a modern, brand-consistent visual identity inspired by developer tools like Gemini CLI.

Backward Compatibility

• Preserves all existing functionality
• Graceful fallback ensures compatibility across different terminal environments
• No breaking changes to existing workflows

Fixes #148.

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