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/components/primitives/input.tsx

@@ -0,0 +1,23 @@
+import { forwardRef, type InputHTMLAttributes } from "react";
+import { cn } from "@/lib/utils";
+
+export interface InputProps extends InputHTMLAttributes<HTMLInputElement> {
+  mono?: boolean;
+}
+
+export const Input = forwardRef<HTMLInputElement, InputProps>(
+  ({ className, mono, ...props }, ref) => (
+    <input
+      ref={ref}
+      className={cn(
+        "w-full bg-[var(--color-surface-2)] text-[var(--color-ink)] placeholder:text-[var(--color-ink-soft)]/60",
+        "rounded-[var(--radius-r-control)] border border-[var(--color-hairline)] px-3 py-2 text-sm",
+        "outline-none focus-visible:ring-2 focus-visible:ring-[var(--color-ring)] transition-colors",
+        mono && "font-mono tracking-tight",
+        className,
+      )}
+      {...props}
+    />
+  ),
+);
+Input.displayName = "Input";