Integrate comprehensive snacks.nvim plugin with enhanced functionality and documentation

[Copilot]

This PR integrates the valuable work from the closed snacks.nvim PRs (#8 and #11) into the current codebase, providing a comprehensive collection of 26+ quality-of-life plugins that enhance the Neovim experience.

Major Features Added

🚀 Core Plugin Integration

• Dashboard: Beautiful startup screen with custom GIGVIM ASCII art and quick access shortcuts
• Advanced Picker: Fast, fuzzy-finding file/buffer picker with live preview
• Git Integration: Seamless LazyGit integration, blame functionality, and browser opening
• File Explorer: Enhanced file tree explorer replacing netrw with Git status indicators
• Performance Optimization: Automatic handling of large files (>1.5MB) with reduced functionality for better performance
• Enhanced Notifications: Advanced notification system with LSP progress integration

⌨️ Comprehensive Keybinding System

Added 20+ intuitive keybindings organized by functionality:

• File Operations: <leader>ff/fb/fg/fr/fs/gf for finding files, buffers, grep, recent files, symbols, and Git files
• Git Operations: <leader>gg/gs/gS/gb/go for LazyGit, blame, status, branch info, and browser opening
• Buffer Management: <leader>bd/ba/bo for smart buffer deletion preserving window layouts
• UI Tools: <leader>e (explorer), <leader>t (terminal)

🎨 Visual Enhancements

• Indent Guides: Enhanced indentation visualization with scope highlighting
• Dim Effects: Focus enhancement by dimming inactive code sections
• Smooth Animations: Polished UI transitions and effects
• Smart Input: Better input dialogs and prompts throughout the interface

Implementation Details

Plugin Architecture

# Main configuration in plugins/optional/snacks-nvim.nix
snacks-nvim = {
  package = snacks-from-source;
  setup = ''
    require('snacks').setup({
      bigfile = { enabled = true },
      dashboard = { enabled = true },
      picker = { enabled = true },
      git = { enabled = true },
      lazygit = { enabled = true },
      // ... 15+ more plugins
    })
  '';
};

Integration Strategy

• nvf Compatible: Uses extraPlugins mechanism following nvf best practices
• Modular Design: Each snack can be independently enabled/disabled
• Conflict Resolution: Carefully designed to coexist with existing GigVim plugins
• Performance Focused: Disabled animations and heavy features for optimal performance

Documentation & Templates

Comprehensive Documentation

• Main Guide: docs/plugins/snacks-nvim.md with complete feature overview
• Individual Docs: Detailed documentation for key plugins (dashboard, picker, lazygit, indent)
• Integration Guide: Step-by-step setup and customization instructions
• Testing Instructions: Verification steps and health check procedures

Configuration Templates

• Default Configuration: Balanced setup with essential enhancements (recommended)
• Minimal Template: Conservative setup for cautious users with minimal risk
• Template Structure: Expandable framework for future configuration variants

Build & Validation

Technical Validation

• ✅ nix flake check passes successfully
• ✅ nix build completes without errors
• ✅ All plugins properly integrated into full.nix configuration
• ✅ Keybindings system properly configured and imported
• ✅ No conflicts with existing git-dev.nvim and themery integrations

Integration Quality

This implementation successfully combines the best elements from the previous attempts:

• PR Fix snacks.nvim dashboard error and implement comprehensive plugin integration with enhanced user experience and interactive features #11: Refined plugin implementation and robust keybinding system
• PR Add comprehensive snacks.nvim integration with documentation and templates #8: Comprehensive documentation, templates, and enhanced workflow guidance
• Current State: Maintains full compatibility with existing integrations

User Experience Impact

Developer Productivity

• Faster File Navigation: Fuzzy finding and recent file access
• Streamlined Git Workflow: Integrated LazyGit with browser opening
• Better Code Structure: Visual indent guides and scope highlighting
• Enhanced Focus: Dimming effects and smooth transitions

Visual Polish

• Professional Interface: Modern, clean design with smooth animations
• Contextual Information: Git status, file types, and project shortcuts
• Consistent Experience: Unified interface across all plugin interactions

Configuration Management

Flake Integration

• Added snacks-nvim input to flake.nix
• Updated flake.lock with locked dependency versions
• Integrated module import in full.nix configuration

File Organization

• Enhanced .gitignore with comprehensive patterns
• Moved documentation to proper docs/ structure
• Updated copilot instructions with ecosystem workflow guidance

This integration transforms GigVim from a basic nvf setup into a polished, feature-rich development environment while maintaining the declarative Nix configuration approach and ensuring compatibility across different environments.

Fixes #15.

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