refactor: full codebase cleanup, dependency updates, and lint fixes

Phase 0: Remove ~920 lines of dead code (ThemeBentoPicker, PromoDiscountBadge,
AdminLayout, SettingsSidebar, MovingGradient, EmptyState, miniapp API, unused
types/functions/transitions/skeleton helpers). Fix API barrel file (add 20 missing exports).

Phase 1: Add ErrorBoundary (app/page/widget levels), centralize constants,
add axios timeout, fix staleTime:0 in React Query.

Phase 2: Consolidate hexToHsl, extract email validation, fix duplicate code.

Phase 3: Fix auth race condition (await checkAdminStatus), memoize useCurrency,
add WebSocket message validation.

Phase 4: Extract useBranding, useFeatureFlags, useScrollRestoration from AppShell.

Phase 5: Remove all eslint-disable react-hooks/exhaustive-deps (14 total),
simplify logger, remove deprecated hooks (useBackButton, useTelegramDnd,
useTelegramWebApp).

Dependencies: React 19, react-router 7, zustand 5, i18next 25, react-i18next 16,
eslint-plugin-react-refresh 0.5. Remove unused @lottiefiles/dotlottie-react.
Convert vite manualChunks to function-based approach for react-router v7 compat.

Lint: Fix logger.ts no-unused-expressions, fix react-refresh/only-export-components
in 6 Radix primitive files (const re-exports → direct re-exports), fix
WebSocketProvider exhaustive-deps. Result: 0 errors, 0 warnings.

Add CLAUDE.md to .gitignore.

src/components/layout/AppShell/Aurora.tsx

@@ -154,6 +154,14 @@ export function Aurora() {
   const background = isDark ? themeColors.darkBackground : themeColors.lightBackground;
   const surface = isDark ? themeColors.darkSurface : themeColors.lightSurface;
 
+  // Refs for initial color values (WebGL context shouldn't recreate on color change)
+  const backgroundRef = useRef(background);
+  backgroundRef.current = background;
+  const surfaceRef = useRef(surface);
+  surfaceRef.current = surface;
+  const accentRef = useRef(themeColors.accent);
+  accentRef.current = themeColors.accent;
+
   // Initialize WebGL context once (only depends on isEnabled)
   useEffect(() => {
     if (!isEnabled || !containerRef.current) return;
@@ -175,7 +183,11 @@ export function Aurora() {
 
     const geometry = new Triangle(gl);
 
-    const colorStops = generateColorStops(background, surface, themeColors.accent);
+    const colorStops = generateColorStops(
+      backgroundRef.current,
+      surfaceRef.current,
+      accentRef.current,
+    );
     const colorStopsArray = colorStops
       .map((hex) => {
         const c = new Color(hex);
@@ -238,7 +250,7 @@ export function Aurora() {
       rendererRef.current = null;
       programRef.current = null;
     };
-  }, [isEnabled]); // eslint-disable-line react-hooks/exhaustive-deps
+  }, [isEnabled]);
 
   // Update color uniforms reactively without recreating WebGL context
   useEffect(() => {