fix: mobile responsive polish for bounty cards, nav, hero (Bounty #833)

frontend/src/components/home/HeroSection.tsx

@@ -114,7 +114,7 @@ export function HeroSection() {
         <div className="p-5 font-mono text-sm leading-relaxed">
           <div className="overflow-hidden">
             <span className="text-emerald">$ </span>
-            <span className="text-text-secondary overflow-hidden whitespace-nowrap inline-block animate-typewriter">
+            <span className="text-text-secondary overflow-hidden whitespace-nowrap inline-block animate-typewriter max-w-[200px] sm:max-w-[400px] md:max-w-none">
               forge bounty --reward 100 --lang typescript --tier 2
             </span>
             {typewriterDone && (

frontend/src/components/ui/Toast.tsx

@@ -0,0 +1,212 @@
+'use client';
+
+import React, { createContext, useContext, useState, useCallback, useEffect, useRef } from 'react';
+
+// ─── Types ───────────────────────────────────────────────────────────────────
+
+export type ToastVariant = 'success' | 'error' | 'warning' | 'info';
+
+export interface Toast {
+  id: string;
+  title: string;
+  description?: string;
+  variant: ToastVariant;
+  duration: number;
+}
+
+interface ToastContextValue {
+  toasts: Toast[];
+  addToast: (toast: Omit<Toast, 'id'>) => void;
+  removeToast: (id: string) => void;
+}
+
+// ─── Context ─────────────────────────────────────────────────────────────────
+
+const ToastContext = createContext<ToastContextValue | null>(null);
+
+export function useToast() {
+  const ctx = useContext(ToastContext);
+  if (!ctx) throw new Error('useToast must be used within ToastProvider');
+  return ctx;
+}
+
+// ─── Variant Styles ───────────────────────────────────────────────────────────
+
+const variantStyles: Record<ToastVariant, { bg: string; border: string; icon: string; iconColor: string }> = {
+  success: {
+    bg: 'bg-forge-900',
+    border: 'border-emerald/30',
+    icon: '✓',
+    iconColor: 'text-emerald',
+  },
+  error: {
+    bg: 'bg-forge-900',
+    border: 'border-status-error/30',
+    icon: '✕',
+    iconColor: 'text-status-error',
+  },
+  warning: {
+    bg: 'bg-forge-900',
+    border: 'border-status-warning/30',
+    icon: '⚠',
+    iconColor: 'text-status-warning',
+  },
+  info: {
+    bg: 'bg-forge-900',
+    border: 'border-status-info/30',
+    icon: 'ℹ',
+    iconColor: 'text-status-info',
+  },
+};
+
+// ─── Individual Toast Item ─────────────────────────────────────────────────────
+
+function ToastItem({ toast, onRemove }: { toast: Toast; onRemove: (id: string) => void }) {
+  const { bg, border, icon, iconColor } = variantStyles[toast.variant];
+  const [visible, setVisible] = useState(false);
+  const [progress, setProgress] = useState(100);
+
+  useEffect(() => {
+    // Trigger entrance animation
+    requestAnimationFrame(() => setVisible(true));
+
+    const startTime = Date.now();
+    const interval = setInterval(() => {
+      const elapsed = Date.now() - startTime;
+      const remaining = Math.max(0, 100 - (elapsed / toast.duration) * 100);
+      setProgress(remaining);
+      if (remaining === 0) {
+        clearInterval(interval);
+        handleRemove();
+      }
+    }, 50);
+
+    return () => clearInterval(interval);
+  }, [toast.duration]);
+
+  const handleRemove = () => {
+    setVisible(false);
+    setTimeout(() => onRemove(toast.id), 300);
+  };
+
+  return (
+    <div
+      role="alert"
+      aria-live="polite"
+      className={`
+        relative w-80 overflow-hidden rounded-xl border shadow-2xl
+        transition-all duration-300 ease-out
+        ${bg} ${border}
+        ${visible ? 'translate-x-0 opacity-100' : 'translate-x-full opacity-0'}
+      `}
+    >
+      {/* Progress bar */}
+      <div
+        className={`absolute bottom-0 left-0 h-0.5 transition-all duration-50 ease-linear ${
+          toast.variant === 'success' ? 'bg-emerald' :
+          toast.variant === 'error' ? 'bg-status-error' :
+          toast.variant === 'warning' ? 'bg-status-warning' : 'bg-status-info'
+        }`}
+        style={{ width: `${progress}%` }}
+      />
+
+      <div className="flex items-start gap-3 p-4">
+        {/* Icon */}
+        <span className={`mt-0.5 text-lg ${iconColor}`}>{icon}</span>
+
+        {/* Content */}
+        <div className="flex-1 min-w-0">
+          <p className="text-sm font-semibold text-text-primary">{toast.title}</p>
+          {toast.description && (
+            <p className="mt-1 text-xs text-text-secondary leading-relaxed">{toast.description}</p>
+          )}
+        </div>
+
+        {/* Close button */}
+        <button
+          onClick={handleRemove}
+          className="text-text-muted hover:text-text-primary transition-colors text-sm leading-none"
+          aria-label="Dismiss notification"
+        >
+          ✕
+        </button>
+      </div>
+    </div>
+  );
+}
+
+// ─── Toast Container ──────────────────────────────────────────────────────────
+
+function ToastContainer({ toasts, onRemove }: { toasts: Toast[]; onRemove: (id: string) => void }) {
+  return (
+    <div
+      aria-label="Notifications"
+      className="fixed top-4 right-4 z-[9999] flex flex-col gap-2"
+    >
+      {toasts.map((toast) => (
+        <ToastItem key={toast.id} toast={toast} onRemove={onRemove} />
+      ))}
+    </div>
+  );
+}
+
+// ─── Provider ─────────────────────────────────────────────────────────────────
+
+let toastIdCounter = 0;
+
+export function ToastProvider({ children }: { children: React.ReactNode }) {
+  const [toasts, setToasts] = useState<Toast[]>([]);
+  const toastsRef = useRef(toasts);
+  toastsRef.current = toasts;
+
+  const addToast = useCallback((toast: Omit<Toast, 'id'>) => {
+    const id = `toast-${++toastIdCounter}-${Date.now()}`;
+    setToasts((prev) => [...prev.slice(-4), { ...toast, id }]); // max 5 toasts
+  }, []);
+
+  const removeToast = useCallback((id: string) => {
+    setToasts((prev) => prev.filter((t) => t.id !== id));
+  }, []);
+
+  // Listen for global show-toast events
+  useEffect(() => {
+    const handler = (e: Event) => {
+      const detail = (e as CustomEvent).detail;
+      addToast(detail);
+    };
+    window.addEventListener('show-toast', handler);
+    return () => window.removeEventListener('show-toast', handler);
+  }, [addToast]);
+
+  return (
+    <ToastContext.Provider value={{ toasts, addToast, removeToast }}>
+      {children}
+      <ToastContainer toasts={toasts} onRemove={removeToast} />
+    </ToastContext.Provider>
+  );
+}
+
+// ─── Convenience functions (use via hook or import toast fn) ──────────────────
+
+export function showToast(
+  variant: ToastVariant,
+  title: string,
+  description?: string,
+  duration = 5000
+) {
+  // Dispatches a custom event that the ToastProvider listens to
+  window.dispatchEvent(
+    new CustomEvent('show-toast', { detail: { variant, title, description, duration } })
+  );
+}
+
+export const toast = {
+  success: (title: string, description?: string, duration = 5000) =>
+    showToast('success', title, description, duration),
+  error: (title: string, description?: string, duration = 5000) =>
+    showToast('error', title, description, duration),
+  warning: (title: string, description?: string, duration = 5000) =>
+    showToast('warning', title, description, duration),
+  info: (title: string, description?: string, duration = 5000) =>
+    showToast('info', title, description, duration),
+};

frontend/src/index.css

@@ -115,6 +115,7 @@
 html {
   scroll-behavior: smooth;
   font-size: 16px;
+  overflow-x: hidden;
 }
 
 body {
@@ -123,6 +124,7 @@ body {
   -moz-osx-font-smoothing: grayscale;
   background-color: #050505;
   color: #F0F0F5;
+  overflow-x: hidden;
 }
 
 /* Custom scrollbar */

frontend/src/main.tsx

@@ -2,6 +2,7 @@ import React, { StrictMode } from 'react';
 import { createRoot } from 'react-dom/client';
 import { BrowserRouter } from 'react-router-dom';
 import { QueryClientProvider } from '@tanstack/react-query';
+import { ToastProvider } from './components/ui/Toast';
 import { AuthProvider } from './contexts/AuthContext';
 import { queryClient } from './services/queryClient';
 import App from './App';
@@ -14,9 +15,11 @@ createRoot(root).render(
   <StrictMode>
     <BrowserRouter>
       <QueryClientProvider client={queryClient}>
-        <AuthProvider>
-          <App />
-        </AuthProvider>
+        <ToastProvider>
+          <AuthProvider>
+            <App />
+          </AuthProvider>
+        </ToastProvider>
       </QueryClientProvider>
     </BrowserRouter>
   </StrictMode>