feat: location-Feld an Organisation, Header-Tooltips

- block-types: OrganisationEntry.location { text, lat, lng }
- Header: title-Attribut auf Social-Icons + Suche-Button

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/block-types.ts

@@ -315,6 +315,7 @@ export interface OrganisationEntry {
   badge?: string | { label?: string; color?: string };
   whatsapp?: string;
   youtube?: string;
+  location?: { text?: string; lat?: number; lng?: number };
 }
 
 /** Organisations-Block (_type: "organisations"). */

src/lib/components/Header.svelte

@@ -202,6 +202,7 @@
                     rel={isInternal ? undefined : "noopener noreferrer"}
                     class="p-1.5 -m-1.5 rounded-xs transition-colors flex items-center justify-center"
                     aria-label={social.label || t(T.header_social_aria)}
+                    title={social.label || t(T.header_social_aria)}
                 >
                     <Icon icon={social.icon} aria-hidden="true" />
                 </a>
@@ -212,6 +213,9 @@
                 aria-label={searchOpen
                     ? t(T.header_search_close)
                     : t(T.header_search_open)}
+                title={searchOpen
+                    ? t(T.header_search_close)
+                    : t(T.header_search_open)}
                 aria-expanded={searchOpen}
                 aria-controls="search-panel"
                 onclick={() => (searchOpen = !searchOpen)}