frontend: RTL sidebar arrow placement + reverse-geocode clinic location

- Arabic RTL: stack the collapse arrow/bell above the nav icons instead of
  pinning them to the opposite edge; mirror the panel-toggle glyph; flip the
  notifications popover to open toward the content side.
- "Use my current location" now reverse-geocodes (OpenStreetMap Nominatim) to
  fill address/city/country, not just latitude/longitude, with a graceful
  coordinates-only fallback. New settings.location.geoPartial key in all 5 locales.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/lib/geocode.ts

@@ -0,0 +1,64 @@
+// Reverse geocoding via OpenStreetMap Nominatim. Used by the clinic-location
+// settings so "Use my current location" can fill the address/city/country
+// fields, not just the raw coordinates.
+//
+// Nominatim's usage policy asks for a descriptive User-Agent/Referer and low
+// request volumes — this is only hit on an explicit button click, so occasional
+// lookups are well within the acceptable-use limits.
+
+export interface ReverseGeocodeResult {
+  address: string;
+  city: string;
+  country: string;
+}
+
+// Reverse-geocode a coordinate into a best-effort street address, city, and
+// country. Resolves to `null` on any failure (network, rate limit, no match) so
+// the caller can silently fall back to coordinates-only.
+export async function reverseGeocode(
+  latitude: number,
+  longitude: number,
+  language?: string,
+): Promise<ReverseGeocodeResult | null> {
+  try {
+    const url = new URL("https://nominatim.openstreetmap.org/reverse");
+    url.searchParams.set("format", "jsonv2");
+    url.searchParams.set("lat", String(latitude));
+    url.searchParams.set("lon", String(longitude));
+    url.searchParams.set("zoom", "18");
+    url.searchParams.set("addressdetails", "1");
+
+    const res = await fetch(url.toString(), {
+      headers: {
+        // Nominatim requires an identifying header; browsers forbid setting
+        // User-Agent, so Accept-Language localises the returned names.
+        "Accept-Language": language || "en",
+      },
+    });
+    if (!res.ok) return null;
+    const data = (await res.json()) as {
+      address?: Record<string, string>;
+      display_name?: string;
+    };
+    const a = data.address ?? {};
+
+    // Compose a street line from the most specific parts available.
+    const street = [a.house_number, a.road].filter(Boolean).join(" ").trim();
+    const address =
+      street ||
+      a.neighbourhood ||
+      a.suburb ||
+      a.pedestrian ||
+      (data.display_name ? data.display_name.split(",")[0] : "") ||
+      "";
+
+    const city =
+      a.city || a.town || a.village || a.municipality || a.county || a.state || "";
+    const country = a.country || "";
+
+    if (!address && !city && !country) return null;
+    return { address, city, country };
+  } catch {
+    return null;
+  }
+}

frontend/lib/i18n/locales/ar/translation.json

@@ -2037,7 +2037,8 @@
       "useMyLocation": "استخدام موقعي الحالي",
       "locating": "جارٍ تحديد الموقع…",
       "geoUnsupported": "الموقع غير متاح على هذا الجهاز.",
-      "geoError": "تعذّر الحصول على موقعك. تحقّق من الأذونات وحاول مرة أخرى."
+      "geoError": "تعذّر الحصول على موقعك. تحقّق من الأذونات وحاول مرة أخرى.",
+      "geoPartial": "تم إدخال الإحداثيات — الرجاء إضافة تفاصيل العنوان يدويًا."
     },
     "signing": {
       "keyTitle": "مفتاح التوقيع",

frontend/lib/i18n/locales/de/translation.json

@@ -2017,7 +2017,8 @@
       "useMyLocation": "Aktuellen Standort verwenden",
       "locating": "Standort wird ermittelt …",
       "geoUnsupported": "Standort ist auf diesem Gerät nicht verfügbar.",
-      "geoError": "Standort konnte nicht ermittelt werden. Bitte Berechtigungen prüfen und erneut versuchen."
+      "geoError": "Standort konnte nicht ermittelt werden. Bitte Berechtigungen prüfen und erneut versuchen.",
+      "geoPartial": "Koordinaten eingetragen – bitte Adressdetails manuell ergänzen."
     },
     "signing": {
       "keyTitle": "Signierschlüssel",

frontend/lib/i18n/locales/en/translation.json

@@ -2017,7 +2017,8 @@
       "useMyLocation": "Use my current location",
       "locating": "Locating…",
       "geoUnsupported": "Location isn't available on this device.",
-      "geoError": "Couldn't get your location. Check permissions and try again."
+      "geoError": "Couldn't get your location. Check permissions and try again.",
+      "geoPartial": "Filled the coordinates — please add the address details manually."
     },
     "signing": {
       "keyTitle": "Signing key",

frontend/lib/i18n/locales/fr/translation.json

@@ -2017,7 +2017,8 @@
       "useMyLocation": "Utiliser ma position actuelle",
       "locating": "Localisation…",
       "geoUnsupported": "La localisation n'est pas disponible sur cet appareil.",
-      "geoError": "Impossible d'obtenir votre position. Vérifiez les autorisations et réessayez."
+      "geoError": "Impossible d'obtenir votre position. Vérifiez les autorisations et réessayez.",
+      "geoPartial": "Coordonnées renseignées — veuillez ajouter l'adresse manuellement."
     },
     "signing": {
       "keyTitle": "Clé de signature",

frontend/lib/i18n/locales/so/translation.json

@@ -2017,7 +2017,8 @@
       "useMyLocation": "Isticmaal goobtayda hadda",
       "locating": "Waa la helayaa goobta…",
       "geoUnsupported": "Goobta laguma heli karo qalabkan.",
-      "geoError": "Lama heli karin goobtaada. Hubi oggolaanshaha oo isku day mar kale."
+      "geoError": "Lama heli karin goobtaada. Hubi oggolaanshaha oo isku day mar kale.",
+      "geoPartial": "Isudhigyada waa la buuxiyay — fadlan gacanta ku gali faahfaahinta ciwaanka."
     },
     "signing": {
       "keyTitle": "Furaha saxiixa",