Enhance authentication and authorization components

- Refactored `AppAuth` to introduce `getGuardContextSchema` for improved user context handling.
- Updated `Authenticator` to utilize `pickKeys` for user data extraction in JWT generation.
- Enhanced `Guard` class to improve permission checks and error handling.
- Modified `SystemController` to return context schema alongside permissions in API responses.
- Added new `permissions` method in `SystemApi` for fetching permissions.
- Improved UI components with additional props and tooltip support for better user experience.

app/src/ui/components/code/CodePreview.tsx

@@ -0,0 +1,73 @@
+import { useEffect, useState } from "react";
+import { useTheme } from "ui/client/use-theme";
+import { cn } from "ui/lib/utils";
+
+export type CodePreviewProps = {
+   code: string;
+   className?: string;
+   lang?: string;
+   theme?: string;
+   enabled?: boolean;
+};
+
+export const CodePreview = ({
+   code,
+   className,
+   lang = "typescript",
+   theme: _theme,
+   enabled = true,
+}: CodePreviewProps) => {
+   const [highlightedHtml, setHighlightedHtml] = useState<string | null>(null);
+   const $theme = useTheme();
+   const theme = (_theme ?? $theme.theme === "dark") ? "github-dark" : "github-light";
+
+   useEffect(() => {
+      if (!enabled) return;
+
+      let cancelled = false;
+      setHighlightedHtml(null);
+
+      async function highlightCode() {
+         try {
+            // Dynamically import Shiki from CDN
+            // @ts-expect-error - Dynamic CDN import
+            const { codeToHtml } = await import("https://esm.sh/shiki@3.13.0");
+
+            if (cancelled) return;
+
+            const html = await codeToHtml(code, {
+               lang,
+               theme,
+               structure: "inline",
+            });
+
+            if (cancelled) return;
+
+            setHighlightedHtml(html);
+         } catch (error) {
+            console.error("Failed to load Shiki:", error);
+            // Fallback to plain text if Shiki fails to load
+            if (!cancelled) {
+               setHighlightedHtml(code);
+            }
+         }
+      }
+
+      highlightCode();
+
+      return () => {
+         cancelled = true;
+      };
+   }, [code, enabled]);
+
+   if (!highlightedHtml) {
+      return <pre className={cn("select-text cursor-text", className)}>{code}</pre>;
+   }
+
+   return (
+      <pre
+         className={cn("select-text cursor-text", className)}
+         dangerouslySetInnerHTML={{ __html: highlightedHtml }}
+      />
+   );
+};