Add event/organisation location with Google Maps links

Events and the organisation profile now have an address, with a
"Directions" link and an embedded Google Maps view (no API key
required) shown on event pages, event cards, and the Contact page.
New events default their location to the org's configured address.

frontend/src/app/dashboard/admin/settings/page.tsx

@@ -10,6 +10,7 @@ import { Building2, Palette, Bell, Mail, Scale, MessageCircle, type LucideIcon }
 import { ColorPickerField } from "@/components/admin/ColorPickerField";
 import { BrandingPreviewPanel } from "@/components/admin/BrandingPreviewPanel";
 import { extractDominantColors } from "@/lib/extractColors";
+import { mapsSearchUrl } from "@/lib/maps";
 
 type TabId = "organisation" | "branding" | "notifications" | "email" | "legal" | "whatsapp";
 
@@ -410,9 +411,15 @@ function SiteSettingsPageInner() {
                   value={orgPhone} onChange={e => setOrgPhone(e.target.value)} />
               </Field>
             </div>
-            <Field label="Address">
+            <Field label="Address" hint="Used as the default location for new events.">
               <input className={inputCls} placeholder="123 Church St, City"
                 value={orgAddress} onChange={e => setOrgAddress(e.target.value)} />
+              {orgAddress.trim() && (
+                <a href={mapsSearchUrl(orgAddress.trim())} target="_blank" rel="noopener noreferrer"
+                  className="inline-block text-xs text-brand-600 hover:underline mt-1">
+                  View on map ↗
+                </a>
+              )}
             </Field>
             <Field label="Site URL" hint="The public URL of this site — used in email links (e.g. password reset, ticket delivery). e.g. https://events.yourchurch.org">
               <input className={inputCls} placeholder="https://events.yourchurch.org"