frontend: UI fixes + settings/patients features

- Record history: replace fragile COSS Timeline separator math with a
  continuous-rail list so every audited change renders in full (RTL-safe).
- Prescriptions: new reusable COSS DatePicker (Popover + Calendar) replaces
  raw <input type="date"> for Start/End date.
- Update banner: rebuilt with COSS Alert variant="warning"; pinned physical
  bottom-right so it stays bottom-right under Arabic RTL.
- AI setup notice: thin attached warning banner with clearer copy; now shown
  above the input in active chats too, not just the empty state.
- Settings profile: wire the previously dead Specialty (Select) and
  Professional links (editable rows) into the persisted preferences.
- Patients: add a status filter and broaden search to conditions/allergies.
- Sidebar user menu: quick language switch submenu (RTL already wired).
- ai-elements: fix a subset of Base UI type drift (22 -> 12; remainder is
  cmdk->Autocomplete migration drift kept behind ignoreBuildErrors).
- i18n: new keys added across all five locales (en/de/fr/ar/so).

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

frontend/components/prescriptions/add-prescription-dialog.tsx

@@ -13,6 +13,7 @@ import { useTranslation } from "react-i18next";
 
 import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
 import { Button } from "@/components/ui/button";
+import { DatePicker } from "@/components/ui/date-picker";
 import {
   Dialog,
   DialogClose,
@@ -578,19 +579,17 @@ export function AddPrescriptionDialog({
                 </div>
                 <div className="grid grid-cols-2 gap-3">
                   <Field label={t("prescriptions.dialog.startDate")}>
-                    <input
-                      className={controlClass}
-                      onChange={(event) => setStartDate(event.target.value)}
-                      type="date"
+                    <DatePicker
+                      onChange={setStartDate}
+                      placeholder={t("prescriptions.dialog.selectDate")}
                       value={startDate}
                     />
                   </Field>
                   <Field label={t("prescriptions.dialog.endDate")}>
-                    <input
-                      className={controlClass}
+                    <DatePicker
                       min={startDate || undefined}
-                      onChange={(event) => setEndDate(event.target.value)}
-                      type="date"
+                      onChange={setEndDate}
+                      placeholder={t("prescriptions.dialog.selectDate")}
                       value={endDate}
                     />
                   </Field>