frontend: light-mode logo via CSS invert + prescriptions search

- sidebar + auth logo now invert to black in light mode (dark unchanged),
  same trick the docs site uses — no second asset needed
- prescriptions page: search by patient, file number, medication,
  prescriber or status, with no-match / empty states

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

frontend/components/sidebar-02/app-sidebar.tsx

@@ -60,9 +60,10 @@ export function DashboardSidebar() {
                 className="flex items-center justify-center"
                 href="#"
               >
+                {/* White fox mark — inverted to black in light mode. */}
                 <Image
                   alt="temetro"
-                  className="size-10 shrink-0"
+                  className="size-10 shrink-0 invert dark:invert-0"
                   height={40}
                   priority
                   src="/temetro-logo.png"