Polish footer menu, Notes spacing, and Appointments add flow

- User menu: rename "Quick nav" to "Search"; add spacing to the clinic
  submenu so it no longer touches the parent menu (sideOffset).
- Notes: lay the list, title, toolbar, and writing area out as separate
  rounded panels with gaps so they're no longer stuck together.
- Sidebar: shorten the "Appointments & Schedule" label to "Appointments".
- Appointments: replace the oversized patient form with a compact
  "New appointment" dialog — pick a patient via quick search by name/file
  number, set time/type/provider; the entry is added to today's schedule.

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

frontend/components/notes/notes-editor.tsx

@@ -108,7 +108,7 @@ export function NotesEditor({
     });
 
   return (
-    <div className="flex h-full flex-col gap-3">
+    <div className="flex h-full flex-col gap-4">
       <div className="flex items-center gap-2">
         <Input
           className="font-medium text-base"
@@ -214,7 +214,7 @@ export function NotesEditor({
         </ToolbarGroup>
       </Toolbar>
 
-      <div className="min-h-0 flex-1 cursor-text overflow-y-auto rounded-xl border bg-card">
+      <div className="min-h-0 flex-1 cursor-text overflow-y-auto rounded-2xl border bg-card/30">
         <EditorContent className="h-full" editor={editor} />
       </div>
     </div>