Revert "refactor(install): remove all unicode symbols and box-drawing characters for clean terminal compatibility"

This reverts commit 98179f5c37.

install.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Dotfiles Installation Script - Cross-Platform
-# Optimiert fuer Fish + Ghostty + Neovim Scratch Setup
+# Optimiert für Fish + Ghostty + Neovim Scratch Setup
 
 set -e  # Exit on error
 
@@ -130,10 +130,11 @@ install_cask() {
 }
 
 header() {
-    echo -e "${BLUE}"
-    echo "QA Engineer Dev Setup"
-    echo "TypeScript/Playwright + Go"
-    echo -e "${NC}"
+    echo -e "${BLUE}
+╔════════════════════════════════════╗
+║   QA Engineer Dev Setup            ║
+║   TypeScript/Playwright + Go       ║
+╚════════════════════════════════════╝${NC}"
 }
 
 check_prerequisites() {
@@ -398,7 +399,7 @@ setup_other_configs() {
         [ -d "$DOTFILES_DIR/.config/btop/themes" ] && ln -sf "$DOTFILES_DIR/.config/btop/themes" ~/.config/btop/themes
     fi
     
-    # Htop (fallback wenn btop abstuerzt)
+    # Htop (fallback wenn btop abstürzt)
     if [ -d "$DOTFILES_DIR/.config/htop" ]; then
         mkdir -p ~/.config/htop
         ln -sf "$DOTFILES_DIR/.config/htop/htoprc" ~/.config/htop/htoprc
@@ -474,7 +475,7 @@ install_optional_ai_tools() {
         log "Google Antigravity CLI (agy) is already installed."
     fi
 
-    echo -e "\n${YELLOW}Optional AI CLI Tools:${NC}"
+    echo -e "\n${YELLOW}=== Optional AI CLI Tools ===${NC}"
     
     # 1. Claude Code
     if prompt_yes_no "Do you want to install Claude Code (@anthropic-ai/claude-code)?"; then
@@ -567,23 +568,24 @@ main() {
     install_playwright
     install_optional_ai_tools
     
-    echo -e "${GREEN}"
-    echo "Setup Complete!"
-    echo ""
-    echo "  [OK] $OS detected"
-    echo "  [OK] Fish shell configured"
-    echo "  [OK] Neovim (Scratch) configured"
-    echo "  [OK] Ghostty terminal configured"
-    echo "  [OK] Development tools installed"
-    echo "  [OK] Dotfiles symlinked"
-    echo ""
-    echo "Next steps:"
-    echo "1. Restart your terminal"
-    echo "2. Run 'nvim' to install plugins"
-    echo "3. Enjoy your setup!"
-    echo ""
-    echo "Backup: $BACKUP_DIR"
-    echo -e "${NC}"
+    echo -e "${GREEN}
+╔══════════════════════════════════════════════════════════╗
+║           Setup Complete!                                ║
+║                                                          ║
+║  ✓ $OS detected                                          ║
+║  ✓ Fish shell configured                                 ║
+║  ✓ Neovim (Scratch) configured                           ║
+║  ✓ Ghostty terminal configured                           ║
+║  ✓ Development tools installed                           ║
+║  ✓ Dotfiles symlinked                                    ║
+║                                                          ║
+║  Next steps:                                             ║
+║  1. Restart your terminal                                ║
+║  2. Run 'nvim' to install plugins                        ║
+║  3. Enjoy your setup!                                    ║
+║                                                          ║
+║  Backup: $BACKUP_DIR                                     ║
+╚══════════════════════════════════════════════════════════╝${NC}"
 }
 
 main "$@"