refactor: replace GSAP animations with CSS animations across components

- Updated RootLayout to include a noise overlay class.
- Refactored LiveModerationFeed to use CSS animations for item entry.
- Simplified AmbientCanvas by removing WebGL and using pure CSS for ambient effects.
- Converted Chatbot to use CSS for floating window animations.
- Updated Card component to include a gradient border.
- Refactored PageTransition to use CSS for fade-scale animations.
- Enhanced SectionHeader with reveal-up animation class.
- Replaced GSAP animations in NavRail with CSS animations for item entry.
- Refactored VoiceStage to use CSS for speaker node animations and pulse rings.
- Removed GSAP dependencies from use-gsap-animation hook, implementing CSS-based stagger reveal.

services/frontend/src/app/(dashboard)/dashboard/view.tsx

@@ -105,7 +105,7 @@ export function DashboardView({
         {/* Tactical HUD Header Bar */}
         <div className="linear-tile flex flex-wrap items-center justify-between gap-3 border-b border-hairline pb-3">
           <div className="flex items-center gap-2.5">
-            <span className="h-2 w-2 rounded-full bg-signal shadow-[0_0_8px_var(--color-signal-glow)]" />
+            <span className="h-2 w-2 rounded-full bg-signal glow-pulse" />
             <h1 className="font-mono text-xs font-semibold tracking-wide text-ink uppercase">
               Telemetry Overview · Node 01
             </h1>