refactor(frontend): finish shadcn→custom primitive migration (green build)

- Remove tw-animate-css import + dead src/components/ui shadcn tree
- Convert 7 orphaned components (moderation, analysis, guild-selector,
  voice/activity-timeline, shared/empty+error) to new primitives
- Add missing moderation/view.tsx; analysis uses SearchPanel directly
- globals.css now uses new signal-driven ops-console tokens
- tsc --noEmit clean, next build green (11 routes), local smoke 200

services/frontend/src/hooks/use-mobile.ts

@@ -1,19 +1,21 @@
-import * as React from "react"
+import * as React from "react";
 
-const MOBILE_BREAKPOINT = 768
+const MOBILE_BREAKPOINT = 768;
 
 export function useIsMobile() {
-  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(undefined)
+  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(
+    undefined,
+  );
 
   React.useEffect(() => {
-    const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`)
+    const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`);
     const onChange = () => {
-      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
-    }
-    mql.addEventListener("change", onChange)
-    setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
-    return () => mql.removeEventListener("change", onChange)
-  }, [])
+      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
+    };
+    mql.addEventListener("change", onChange);
+    setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
+    return () => mql.removeEventListener("change", onChange);
+  }, []);
 
-  return !!isMobile
+  return !!isMobile;
 }