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/sidebar-02/nav-user.tsx

@@ -4,6 +4,7 @@ import {
   Building2,
   Check,
   ChevronsUpDown,
+  Languages,
   LogOut,
   Moon,
   Plus,
@@ -49,6 +50,8 @@ import {
   useSidebar,
 } from "@/components/ui/sidebar";
 import { authClient } from "@/lib/auth-client";
+import { supportedLanguages } from "@/lib/i18n/config";
+import { persistLanguage } from "@/lib/language";
 import { useActiveRole } from "@/lib/roles";
 import { notify } from "@/lib/toast";
 
@@ -82,7 +85,13 @@ function GitHubIcon({ className }: { className?: string }) {
 // shortcut hint (below Theme) and a clinic switcher submenu (below that) whose
 // popup reveals the active clinic's details on hover.
 export function NavUser() {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const activeLang = i18n.resolvedLanguage ?? i18n.language;
+  const changeLanguage = (lng: string) => {
+    if (lng === activeLang) return;
+    void i18n.changeLanguage(lng);
+    void persistLanguage(lng);
+  };
   const { isMobile, state } = useSidebar();
   const isCollapsed = state === "collapsed";
   const router = useRouter();
@@ -197,6 +206,29 @@ export function NavUser() {
               </MenuShortcut>
             </MenuItem>
 
+            {/* Language: quick switch (also available in Settings). Applies
+                immediately and roams via the backend preferences. */}
+            <MenuSub>
+              <MenuSubTrigger>
+                <Languages />
+                <span className="truncate">{t("userMenu.language")}</span>
+              </MenuSubTrigger>
+              <MenuSubPopup className="min-w-44" sideOffset={8}>
+                {supportedLanguages.map((lng) => (
+                  <MenuItem
+                    className="gap-2"
+                    key={lng}
+                    onClick={() => changeLanguage(lng)}
+                  >
+                    <span className="flex-1 truncate">
+                      {t(`settings.profile.language.${lng}`)}
+                    </span>
+                    {lng === activeLang && <Check className="size-4" />}
+                  </MenuItem>
+                ))}
+              </MenuSubPopup>
+            </MenuSub>
+
             {/* Command palette: hint + shortcut, sits below Theme. */}
             <MenuItem onClick={openCommand}>
               <Search />