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

@@ -259,7 +259,8 @@
     "createDialogDescription": "Add a new clinic and switch to it.",
     "signOutFailed": "Sign out failed",
     "tryAgain": "Please try again.",
-    "signedOut": "Signed out"
+    "signedOut": "Signed out",
+    "language": "Language"
   },
   "clinic": {
     "create": "Create clinic",
@@ -362,7 +363,9 @@
       "doneTitle": "Patient deleted",
       "failedTitle": "Couldn't delete patient",
       "failedBody": "Please try again."
-    }
+    },
+    "filterStatus": "Filter by status",
+    "allStatuses": "All statuses"
   },
   "appointments": {
     "title": "Appointments & Schedule",
@@ -599,7 +602,8 @@
       "removeDates": "Remove",
       "startDate": "Start date",
       "endDate": "End date",
-      "addDates": "Add start/end dates"
+      "addDates": "Add start/end dates",
+      "selectDate": "Select date"
     }
   },
   "pharmacy": {
@@ -1866,7 +1870,9 @@
         "pendingApprovalsDesc": "Notify me when a patient approves or rejects a pending change",
         "recordsShared": "Records shared with me",
         "recordsSharedDesc": "Notify me when a patient shares a record with me"
-      }
+      },
+      "linkPlaceholder": "https://example.com",
+      "removeLink": "Remove link"
     },
     "careTeam": {
       "title": "Care team",