fix(ui): Fix ASCII banner colors and add syntax display to explain mode

## Fixes

### 1. ASCII Banner Colors Fixed
- Changed from heredoc to echo -e statements
- ANSI escape codes now render properly
- Cyan and yellow colors display correctly
- No more literal escape codes showing

Before:
[0;36m
    ____             __       ____
(escape codes displayed as text)

After:
Properly colored cyan ASCII art with yellow tagline

### 2. Enhanced Explain Mode with Syntax
- Added SYNOPSIS/SYNTAX section before description
- Extracts syntax from man pages automatically
- Shows command usage patterns clearly
- Works for regular commands and shell builtins
- Multiple fallbacks for robustness:
  1. Man page SYNOPSIS section
  2. Command --help usage line
  3. Generic fallback pattern

Example output:
SYNTAX:
  grep [OPTION...] PATTERNS [FILE...]
  grep [OPTION...] -e PATTERNS ... [FILE...]

Description: Search for text pattern in files recursively

## Testing
- ✅ Banner colors display correctly
- ✅ Syntax shows for tar, grep, find
- ✅ Works with shell builtins (cd, echo)
- ✅ Fallback patterns work when man page incomplete
- ✅ No breaking changes to existing functionality

Closes: UI color display issue
Closes: Syntax display request

bash-helper.sh

@@ -17,17 +17,15 @@ NC='\033[0m' # No Color
 
 # ASCII Banner
 show_banner() {
-  cat << "EOF"
-[0;36m
-    ____             __       ____            __    __
-   / __ )____ ______/ /_     / __ )__  ______/ /___/ /_  __
-  / __  / __ `/ ___/ __ \   / __  / / / / __  / __  / / / /
- / /_/ / /_/ (__  ) / / /  / /_/ / /_/ / /_/ / /_/ / /_/ /
-/_____/\__,_/____/_/ /_/  /_____/\__,_/\__,_/\__,_/\__, /
-                                                   /____/
-[0;33m        Your Intelligent CLI Assistant for Bash
-[0m
-EOF
+  echo -e "${CYAN}"
+  echo "    ____             __       ____            __    __"
+  echo "   / __ )____ ______/ /_     / __ )__  ______/ /___/ /_  __"
+  echo "  / __  / __ \`/ ___/ __ \\   / __  / / / / __  / __  / / / /"
+  echo " / /_/ / /_/ (__  ) / / /  / /_/ / /_/ / /_/ / /_/ / /_/ /"
+  echo "/_____/\\__,_/____/_/ /_/  /_____/\\__,_/\\__,_/\\__,_/\\__, /"
+  echo "                                                   /____/"
+  echo -e "${YELLOW}        Your Intelligent CLI Assistant for Bash${NC}"
+  echo ""
 }
 
 show_help() {
@@ -406,6 +404,36 @@ mode_explain() {
   echo -e "${BLUE}═══════════════════════════════════════════════════════════${NC}"
   echo ""
 
+  # Get syntax from man page SYNOPSIS section
+  if command -v "$base_cmd" &> /dev/null || type "$base_cmd" 2>/dev/null | grep -q "shell builtin"; then
+    echo -e "${CYAN}${BOLD}SYNTAX:${NC}"
+
+    if type "$base_cmd" 2>/dev/null | grep -q "shell builtin"; then
+      # For builtins, get the first line of help
+      local syntax=$(help "$base_cmd" 2>/dev/null | head -1 | sed 's/^[[:space:]]*//')
+      if [ -n "$syntax" ]; then
+        echo -e "  ${GREEN}$syntax${NC}"
+      else
+        echo -e "  ${GREEN}$base_cmd [options]${NC}"
+      fi
+    else
+      # For regular commands, extract SYNOPSIS section from man page
+      local synopsis=$(man "$base_cmd" 2>/dev/null | col -b | sed -n '/^SYNOPSIS/,/^DESCRIPTION/p' | head -15 | tail -n +2 | head -n -1 | sed 's/^[[:space:]]*/  /')
+      if [ -n "$synopsis" ]; then
+        echo -e "${GREEN}$synopsis${NC}"
+      else
+        # Fallback: try to get usage from command itself
+        local usage=$("$base_cmd" --help 2>&1 | grep -i "usage" | head -1 | sed 's/^[Uu]sage: /  /')
+        if [ -n "$usage" ]; then
+          echo -e "  ${GREEN}$usage${NC}"
+        else
+          echo -e "  ${GREEN}$base_cmd [options]${NC}"
+        fi
+      fi
+    fi
+    echo ""
+  fi
+
   # Try to find in database
   local found_in_db=false
   if check_jq && check_database; then