fix: Remove deprecated code and complete menu-functions integration

CLEANUP:
- Removed unused safe_read_choice() function (replaced by menu-functions.sh)
- Converted remaining handle_loadwatch_analyzer() to use new menu system
- All menu handlers now use MENU_CHOICE and menu-functions consistently

QA VERIFICATION:
✓ Syntax check: PASSED
✓ No deprecated read patterns remaining
✓ All 11 menu functions using new system
✓ All 11 handlers using MENU_CHOICE
✓ All error handling using menu_invalid_choice

STATUS:
Complete menu system migration to lib/menu-functions.sh
Ready for production use in dev branch

launcher.sh

@@ -33,18 +33,6 @@ source "$LIB_DIR/user-manager.sh" || { echo "ERROR: Failed to load user-manager.
 source "$LIB_DIR/reference-db.sh" || { echo "ERROR: Failed to load reference-db.sh"; return 1; }
 source "$LIB_DIR/menu-functions.sh" || { echo "ERROR: Failed to load menu-functions.sh"; return 1; }
 
-# Safe read helper function - handles both interactive and non-interactive modes
-safe_read_choice() {
-    if [ "$INTERACTIVE_MODE" -eq 0 ]; then
-        # Non-interactive: return 1 to indicate read failed
-        return 1
-    fi
-
-    if ! read -r choice </dev/tty 2>/dev/null; then
-        return 1
-    fi
-}
-
 # Color codes
 RED='\033[0;31m'
 YELLOW='\033[1;33m'
@@ -502,33 +490,29 @@ handle_loadwatch_analyzer() {
     fi
 
     show_banner
-    echo -e "📊 Loadwatch Health Analyzer"
-    echo ""
-    echo -e "Select time range for analysis:"
-    echo ""
-    echo -e "  1) Last 1 Hour      - Recent activity"
-    echo -e "  2) Last 6 Hours     - Mid-term trending"
-    echo -e "  3) Last 24 Hours    - Full day analysis"
-    echo -e "  4) Last 7 Days      - Weekly patterns"
-    echo -e "  5) Last 30 Days     - Monthly overview"
-    echo ""
-    echo -e "  0) Back"
-    echo ""
-    echo -e "──────────────────────────────────────────────────────────────"
-    echo -n "Select time range: "
+    menu_header "Loadwatch Health Analyzer"
 
-    if ! read -r range_choice </dev/tty 2>/dev/null; then
-        return 0  # Exit if read fails
-    fi
+    menu_section "Select time range for analysis"
+    menu_option 1 "Last 1 Hour" "Recent activity"
+    menu_option 2 "Last 6 Hours" "Mid-term trending"
+    menu_option 3 "Last 24 Hours" "Full day analysis"
+    menu_option 4 "Last 7 Days" "Weekly patterns"
+    menu_option 5 "Last 30 Days" "Monthly overview"
 
-    case "$range_choice" in
+    echo ""
+    menu_back "Performance Menu"
+    menu_divider
+
+    read_menu_choice "Select time range" 0 5
+
+    case "$MENU_CHOICE" in
         1) run_module "diagnostics" "loadwatch-analyzer.sh" "-r" "1h" ;;
         2) run_module "diagnostics" "loadwatch-analyzer.sh" "-r" "6h" ;;
         3) run_module "diagnostics" "loadwatch-analyzer.sh" "-r" "24h" ;;
         4) run_module "diagnostics" "loadwatch-analyzer.sh" "-r" "7d" ;;
         5) run_module "diagnostics" "loadwatch-analyzer.sh" "-r" "30d" ;;
         0) return ;;
-        *) echo -e "Invalid option"; sleep 1 ;;
+        *) menu_invalid_choice ;;
     esac
 }