Build temetro app: dark theme, clinical sidebar, AI chat, settings page

- Linear-inspired dark theme (app/globals.css), forced dark in layout
- Clinical sidebar (components/sidebar-02) with temetro brand
- AI chat UI (components/chat): Cursor-style input, UI-only mock replies
- Settings page (components/settings): Polar-style tabs/sections, UI only
- Route-group app shell: app/(app)/{layout,page,settings}
- shadcn (Base UI) + ai-elements component libraries
- CLAUDE.md: architecture notes + per-folder commit policy

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

frontend/components/ai-elements/suggestion.tsx

@@ -0,0 +1,57 @@
+"use client";
+
+import { Button } from "@/components/ui/button";
+import {
+  ScrollArea,
+  ScrollBar,
+} from "@/components/ui/scroll-area";
+import { cn } from "@/lib/utils";
+import type { ComponentProps } from "react";
+import { useCallback } from "react";
+
+export type SuggestionsProps = ComponentProps<typeof ScrollArea>;
+
+export const Suggestions = ({
+  className,
+  children,
+  ...props
+}: SuggestionsProps) => (
+  <ScrollArea className="w-full overflow-x-auto whitespace-nowrap" {...props}>
+    <div className={cn("flex w-max flex-nowrap items-center gap-2", className)}>
+      {children}
+    </div>
+    <ScrollBar className="hidden" orientation="horizontal" />
+  </ScrollArea>
+);
+
+export type SuggestionProps = Omit<ComponentProps<typeof Button>, "onClick"> & {
+  suggestion: string;
+  onClick?: (suggestion: string) => void;
+};
+
+export const Suggestion = ({
+  suggestion,
+  onClick,
+  className,
+  variant = "outline",
+  size = "sm",
+  children,
+  ...props
+}: SuggestionProps) => {
+  const handleClick = useCallback(() => {
+    onClick?.(suggestion);
+  }, [onClick, suggestion]);
+
+  return (
+    <Button
+      className={cn("cursor-pointer rounded-full px-4", className)}
+      onClick={handleClick}
+      size={size}
+      type="button"
+      variant={variant}
+      {...props}
+    >
+      {children || suggestion}
+    </Button>
+  );
+};