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/chat/chat-panel.tsx

@@ -723,8 +723,7 @@ export function ChatPanel() {
           <div className="flex w-full flex-col gap-3">
             {errorAlert}
             {veilGate}
-            {/* One-time setup heads-up — only on the empty state, so it clears
-                itself once the first message is sent. */}
+            {/* Setup heads-up when no AI provider is configured. */}
             <AiSetupNotice />
             {promptInput}
             <Suggestions className="justify-center pt-1">
@@ -761,6 +760,9 @@ export function ChatPanel() {
         {errorAlert}
         {veilGate}
         {queuePanel}
+        {/* Also warn mid-conversation when no AI provider is configured, so
+            failing replies have a visible cause and a fix. */}
+        <AiSetupNotice />
         {promptInput}
       </div>
     </div>