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/ai-elements/plan.tsx

@@ -128,5 +128,18 @@ export const PlanFooter = (props: PlanFooterProps) => (
 export type PlanTriggerProps = ComponentProps<typeof CollapsibleTrigger>;
 
 export const PlanTrigger = ({ className, ...props }: PlanTriggerProps) => (
-  <CollapsibleTrigger render={<Button className={cn("size-8", className)} data-slot="plan-trigger" size="icon" variant="ghost" {...props} />}><ChevronsUpDownIcon className="size-4" /><span className="sr-only">Toggle plan</span></CollapsibleTrigger>
+  <CollapsibleTrigger
+    {...props}
+    render={
+      <Button
+        className={cn("size-8", className)}
+        data-slot="plan-trigger"
+        size="icon"
+        variant="ghost"
+      />
+    }
+  >
+    <ChevronsUpDownIcon className="size-4" />
+    <span className="sr-only">Toggle plan</span>
+  </CollapsibleTrigger>
 );