feat: add expense tracker pro play

src/plays/expense-tracker-pro/ExpenseTrackerPro.jsx

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+import PlayHeader from 'common/playlists/PlayHeader';
+import useTransactions from './hooks/useTransaction';
+import SummaryCards from './components/SummaryCards';
+import TransactionForm from './components/TransactionForm';
+import TransactionList from './components/TransactionList';
+import Charts from './components/Charts';
+
+function ExpenseTrackerPro(props) {
+  const {
+    filtered,
+    summary,
+    chartData,
+    monthlyData,
+    availableMonths,
+    filterType,
+    setFilterType,
+    filterMonth,
+    setFilterMonth,
+    addTransaction,
+    deleteTransaction,
+    clearAll
+  } = useTransactions();
+
+  return (
+    <div className="play-details">
+      <PlayHeader play={props} />
+      <div className="grow p-4 overflow-y-auto bg-gray-50">
+        <div className="max-w-4xl mx-auto">
+          <SummaryCards summary={summary} />
+          <Charts chartData={chartData} monthlyData={monthlyData} />
+          <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
+            <TransactionForm onAdd={addTransaction} />
+            <TransactionList
+              availableMonths={availableMonths}
+              filterMonth={filterMonth}
+              filterType={filterType}
+              setFilterMonth={setFilterMonth}
+              setFilterType={setFilterType}
+              transactions={filtered}
+              onDelete={deleteTransaction}
+            />
+          </div>
+          {filtered.length > 0 && (
+            <div className="text-center mt-4">
+              <button
+                className="text-xs text-red-400 hover:text-red-600 transition-colors"
+                onClick={clearAll}
+              >
+                Clear All Transactions
+              </button>
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export default ExpenseTrackerPro;

src/plays/expense-tracker-pro/Readme.md

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+@'
+## Expense Tracker Pro
+
+A full-featured expense tracker built with React that helps you manage income and expenses.
+
+### Features
+- Track income and expenses with categories
+- Summary cards showing balance, total income, total expenses
+- Visual charts — expenses by category (bar) and monthly overview
+- Filter by type (income/expense) and month
+- localStorage persistence — data saved between sessions
+- Delete individual transactions or clear all
+
+### Concepts Used
+- useState, useEffect, useMemo
+- Custom hook (useTransactions)
+- localStorage for data persistence
+- CSS-based charts (no external chart library)
+- Tailwind CSS for styling
+'@ | Out-File -FilePath src/plays/expense-tracker-pro/Readme.md -Encoding utf8

src/plays/expense-tracker-pro/components/Charts.jsx

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+import { getCategoryMeta, CHART_COLORS } from '../constants/categories';
+import { formatCurrency, getMonthLabel } from '../utils/format';
+
+const ExpenseChart = ({ data }) => {
+  if (!data.length)
+    return (
+      <div className="flex items-center justify-center h-32 text-gray-400 text-sm">
+        No expense data yet
+      </div>
+    );
+  const total = data.reduce((sum, d) => sum + d.amount, 0);
+
+  return (
+    <div className="space-y-2">
+      {data.map((item, i) => {
+        const meta = getCategoryMeta(item.category);
+        const pct = total ? (item.amount / total) * 100 : 0;
+
+        return (
+          <div key={item.category}>
+            <div className="flex justify-between text-xs text-gray-600 mb-0.5">
+              <span>
+                {meta.icon} {meta.label}
+              </span>
+              <span>
+                {formatCurrency(item.amount)} ({pct.toFixed(0)}%)
+              </span>
+            </div>
+            <div className="w-full bg-gray-100 rounded-full h-2">
+              <div
+                className="h-2 rounded-full transition-all duration-500"
+                style={{ width: `${pct}%`, backgroundColor: CHART_COLORS[i % CHART_COLORS.length] }}
+              />
+            </div>
+          </div>
+        );
+      })}
+    </div>
+  );
+};
+
+const MonthlyChart = ({ data }) => {
+  if (!data.length)
+    return (
+      <div className="flex items-center justify-center h-32 text-gray-400 text-sm">
+        No monthly data yet
+      </div>
+    );
+  const max = Math.max(...data.flatMap((d) => [d.income, d.expense]));
+
+  return (
+    <div className="flex items-end gap-3 h-32">
+      {data.map((item) => (
+        <div className="flex-1 flex flex-col items-center gap-1" key={item.month}>
+          <div className="w-full flex gap-1 items-end" style={{ height: '96px' }}>
+            <div
+              className="flex-1 bg-green-400 rounded-t transition-all duration-500"
+              style={{ height: `${max ? (item.income / max) * 96 : 0}px` }}
+            />
+            <div
+              className="flex-1 bg-orange-400 rounded-t transition-all duration-500"
+              style={{ height: `${max ? (item.expense / max) * 96 : 0}px` }}
+            />
+          </div>
+          <p className="text-xs text-gray-400 truncate w-full text-center">
+            {getMonthLabel(item.month).split(' ')[0]}
+          </p>
+        </div>
+      ))}
+    </div>
+  );
+};
+
+const Charts = ({ chartData, monthlyData }) => (
+  <div className="grid grid-cols-1 sm:grid-cols-2 gap-4 mb-4">
+    <div className="bg-white border border-gray-200 rounded-xl p-4">
+      <h3 className="font-bold text-gray-700 text-sm mb-3">Expenses by Category</h3>
+      <ExpenseChart data={chartData} />
+    </div>
+    <div className="bg-white border border-gray-200 rounded-xl p-4">
+      <h3 className="font-bold text-gray-700 text-sm mb-3">Monthly Overview</h3>
+      <div className="flex gap-3 text-xs text-gray-500 mb-2">
+        <span className="flex items-center gap-1">
+          <span className="w-3 h-3 bg-green-400 rounded-sm inline-block" /> Income
+        </span>
+        <span className="flex items-center gap-1">
+          <span className="w-3 h-3 bg-orange-400 rounded-sm inline-block" /> Expense
+        </span>
+      </div>
+      <MonthlyChart data={monthlyData} />
+    </div>
+  </div>
+);
+
+export default Charts;

src/plays/expense-tracker-pro/components/SummaryCards.jsx

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+import { formatCurrency } from '../utils/format';
+
+const SummaryCards = ({ summary }) => {
+  const { income, expense, balance } = summary;
+
+  return (
+    <div className="grid grid-cols-1 sm:grid-cols-3 gap-3 mb-4">
+      <div
+        className={`rounded-xl p-4 border ${balance >= 0 ? 'bg-green-50 border-green-200' : 'bg-red-50 border-red-200'}`}
+      >
+        <p className="text-xs text-gray-500 uppercase tracking-wider mb-1">Balance</p>
+        <p className={`text-2xl font-bold ${balance >= 0 ? 'text-green-600' : 'text-red-600'}`}>
+          {formatCurrency(balance)}
+        </p>
+      </div>
+      <div className="rounded-xl p-4 border bg-blue-50 border-blue-200">
+        <p className="text-xs text-gray-500 uppercase tracking-wider mb-1">Income</p>
+        <p className="text-2xl font-bold text-blue-600">{formatCurrency(income)}</p>
+      </div>
+      <div className="rounded-xl p-4 border bg-orange-50 border-orange-200">
+        <p className="text-xs text-gray-500 uppercase tracking-wider mb-1">Expenses</p>
+        <p className="text-2xl font-bold text-orange-600">{formatCurrency(expense)}</p>
+      </div>
+    </div>
+  );
+};
+
+export default SummaryCards;

src/plays/expense-tracker-pro/components/TransactionForm.jsx

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+import { useState } from 'react';
+import { CATEGORIES } from '../constants/categories';
+
+const defaultForm = {
+  type: 'expense',
+  amount: '',
+  category: '',
+  description: '',
+  date: new Date().toISOString().split('T')[0]
+};
+
+const TransactionForm = ({ onAdd }) => {
+  const [form, setForm] = useState(defaultForm);
+  const [error, setError] = useState('');
+
+  const handleChange = (e) => {
+    const { name, value } = e.target;
+    setForm((prev) => ({
+      ...prev,
+      [name]: value,
+      ...(name === 'type' ? { category: '' } : {})
+    }));
+  };
+
+  const handleSubmit = (e) => {
+    e.preventDefault();
+    if (!form.amount || isNaN(form.amount) || parseFloat(form.amount) <= 0)
+      return setError('Please enter a valid amount.');
+    if (!form.category) return setError('Please select a category.');
+    if (!form.description.trim()) return setError('Please enter a description.');
+    setError('');
+    onAdd(form);
+    setForm({ ...defaultForm, type: form.type });
+  };
+
+  const currentCategories = CATEGORIES[form.type];
+  const inputClass =
+    'w-full border border-gray-300 rounded-lg px-3 py-2 text-sm outline-none focus:border-blue-400 transition-colors';
+
+  return (
+    <div className="bg-white border border-gray-200 rounded-xl p-4 mb-4">
+      <h2 className="font-bold text-gray-700 mb-3">Add Transaction</h2>
+      <div className="flex rounded-lg overflow-hidden border border-gray-200 mb-3">
+        {['expense', 'income'].map((type) => (
+          <button
+            className={`flex-1 py-2 text-sm font-semibold capitalize transition-colors ${
+              form.type === type
+                ? type === 'expense'
+                  ? 'bg-red-500 text-white'
+                  : 'bg-green-500 text-white'
+                : 'bg-gray-50 text-gray-500'
+            }`}
+            key={type}
+            type="button"
+            onClick={() => setForm({ ...defaultForm, type })}
+          >
+            {type === 'expense' ? 'Expense' : 'Income'}
+          </button>
+        ))}
+      </div>
+      <form className="space-y-3" onSubmit={handleSubmit}>
+        <div className="grid grid-cols-2 gap-2">
+          <div>
+            <label className="text-xs text-gray-500 mb-1 block">Amount</label>
+            <input
+              className={inputClass}
+              min="0"
+              name="amount"
+              placeholder="0.00"
+              step="0.01"
+              type="number"
+              value={form.amount}
+              onChange={handleChange}
+            />
+          </div>
+          <div>
+            <label className="text-xs text-gray-500 mb-1 block">Date</label>
+            <input
+              className={inputClass}
+              name="date"
+              type="date"
+              value={form.date}
+              onChange={handleChange}
+            />
+          </div>
+        </div>
+        <div>
+          <label className="text-xs text-gray-500 mb-1 block">Category</label>
+          <div className="flex flex-wrap gap-1.5">
+            {currentCategories.map((cat) => (
+              <button
+                className={`px-2.5 py-1 rounded-lg text-xs font-medium border transition-colors ${
+                  form.category === cat.id
+                    ? 'bg-blue-500 text-white border-blue-500'
+                    : 'bg-gray-50 text-gray-600 border-gray-200 hover:border-blue-300'
+                }`}
+                key={cat.id}
+                type="button"
+                onClick={() => setForm((p) => ({ ...p, category: cat.id }))}
+              >
+                {cat.icon} {cat.label}
+              </button>
+            ))}
+          </div>
+        </div>
+        <div>
+          <label className="text-xs text-gray-500 mb-1 block">Description</label>
+          <input
+            className={inputClass}
+            name="description"
+            placeholder="What was this for?"
+            type="text"
+            value={form.description}
+            onChange={handleChange}
+          />
+        </div>
+        {error && <p className="text-red-500 text-xs">{error}</p>}
+        <button
+          className="w-full bg-blue-500 hover:bg-blue-600 text-white font-bold py-2.5 rounded-lg transition-colors text-sm"
+          type="submit"
+        >
+          Add Transaction
+        </button>
+      </form>
+    </div>
+  );
+};
+
+export default TransactionForm;