fix: address Globalping code review findings

## Changes

### Critical fixes
- Fix Switch `isChecked` → `checked` prop in CreateMonitor Globalping toggle
- Merge double `getDBSettings()` calls in globalpingService into single
  `getClientAndLocations()` method to eliminate redundant DB reads per check cycle
- Add in-flight lock (Set) to prevent overlapping Globalping checks for the same monitor
- Add hostname validation before calling Globalping API to prevent invalid targets

### Dead code removal
- Remove unused `locations` field from server Monitor type, Mongoose model,
  Joi validation, and repository mappers
- Remove unused `locations` field from client Monitor type
- Remove dead `getLimits()` method from globalpingService
- Remove dead `locations` translation keys from en.json
- Remove dead `monitorType`, `groupedUpChecks`, `groupedDownChecks` fields
  from findLocationChecksByMonitorId return value

### Medium/low fixes
- Make globalping/locations API fetch conditional on `monitor.globalpingEnabled`
  in Details page to avoid unnecessary requests
- Add useEffect to reset selectedLocationTab when location keys change
  to prevent out-of-bounds tab index
- Add `globalpingEnabled: false` to default case in useMonitorForm
- Replace console.log with comment in CreateMonitor onError handler
- Add aria-label to Globe icon for accessibility
- Add warning log when Globalping buildCheck returns undefined
- Fix step numbering in SuperSimpleQueueHelper (was duplicated Step 4)

## Benefits
- Eliminates one DB round-trip per monitor check cycle
- Prevents race conditions with overlapping Globalping checks
- Validates hostnames before external API calls
- Removes ~30 lines of dead code across server and client
- Improves accessibility with proper aria labels

client/src/Hooks/useMonitorForm.ts

@@ -102,6 +102,7 @@ export const useMonitorForm = ({
 					matchMethod: "",
 					expectedValue: "",
 					jsonPath: "",
+					globalpingEnabled: false,
 				};
 		}
 

client/src/Pages/CreateMonitor/index.tsx

@@ -222,8 +222,8 @@ const CreateMonitorPage = () => {
 		}
 	};
 
-	const onError = (errors: unknown) => {
-		console.log(errors);
+	const onError = (_errors: unknown) => {
+		// Validation errors are shown inline via react-hook-form field errors
 	};
 
 	return (
@@ -500,7 +500,7 @@ const CreateMonitorPage = () => {
 							render={({ field }) => (
 								<Switch
 									id="globalpingEnabled"
-									isChecked={field.value ?? false}
+									checked={field.value ?? false}
 									onChange={(e) => field.onChange(e.target.checked)}
 								/>
 							)}

client/src/Pages/Uptime/Details/index.tsx

@@ -17,7 +17,7 @@ import { MonitorStatBoxes } from "@/Components/v2/monitors";
 
 import { useTheme } from "@mui/material/styles";
 import { useIsAdmin } from "@/Hooks/useIsAdmin";
-import { useState, useMemo } from "react";
+import { useState, useMemo, useEffect } from "react";
 import { useParams } from "react-router-dom";
 import { useSelector } from "react-redux";
 import { useGet } from "@/Hooks/UseApi";
@@ -113,10 +113,11 @@ const UptimeDetailsPage = () => {
 	const checks = checksData?.checks ?? [];
 	const checksCount = checksData?.checksCount ?? 0;
 
+	const globalpingLocationsUrl = monitor?.globalpingEnabled ? "/monitors/globalping/locations" : null;
 	const { data: globalpingData } = useGet<{
 		locations: { id: string; label: string }[];
 		labels: Record<string, string>;
-	}>("/monitors/globalping/locations");
+	}>(globalpingLocationsUrl);
 	const locationLabels = globalpingData?.labels ?? {};
 
 	const locationChecks = monitorData?.locationChecks;
@@ -124,6 +125,12 @@ const UptimeDetailsPage = () => {
 		() => (locationChecks ? Object.keys(locationChecks).sort() : []),
 		[locationChecks]
 	);
+
+	// Reset tab index when location keys change to prevent out-of-bounds
+	useEffect(() => {
+		setSelectedLocationTab(0);
+	}, [locationKeys.length]);
+
 	const selectedLocation = locationKeys[selectedLocationTab] ?? null;
 	const selectedLocationData: LocationCheckData | null =
 		selectedLocation && locationChecks ? locationChecks[selectedLocation] : null;

client/src/Pages/Uptime/Monitors/Components/UptimeMonitorsTable.tsx

@@ -177,7 +177,7 @@ export const MonitorTable = ({
 							{row?.name}
 							{row.globalpingEnabled && (
 								<Tooltip title={t("pages.uptime.table.headers.globalpingEnabled")}>
-									<Globe size={14} />
+									<Globe size={14} aria-label={t("pages.uptime.table.headers.globalpingEnabled")} />
 								</Tooltip>
 							)}
 						</Stack>

client/src/Types/Monitor.ts

@@ -58,7 +58,6 @@ export interface Monitor {
 	selectedDisks: string[];
 	gameId?: string;
 	group: string | null;
-	locations: string[];
 	globalpingEnabled: boolean;
 	recentChecks: CheckSnapshot[];
 	createdAt: string;

client/src/locales/en.json

@@ -496,12 +496,6 @@
 						"hardware": "Monitor CPU, memory, disk usage, and temperature for your infrastructure."
 					}
 				},
-				"locations": {
-					"title": "Global locations",
-					"description": "Run uptime checks from multiple geographic regions using Globalping. Select up to 5 locations.",
-					"label": "Check locations",
-					"placeholder": "Select locations"
-				},
 				"ignoreTls": {
 					"description": "Configure TLS/SSL certificate validation for HTTPS connections.",
 					"option": {
@@ -1158,7 +1152,6 @@
 			"table": {
 				"headers": {
 					"responseTime": "Response time",
-					"locations": "Locations",
 					"globalpingEnabled": "Global monitoring enabled"
 				}
 			},