feat(saju): useSajuForm + SajuInputForm + ActionCard

src/pages/saju/components/ActionCard.jsx

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+import React from 'react';
+import { Link } from 'react-router-dom';
+
+const ICON = {
+  today: '☀',
+  heart: '♥',
+  book: '📖',
+};
+
+export default function ActionCard({ to, icon, title, desc, variant = 'saju', disabled = false }) {
+  const cls = `saju-action-card saju-action-card--${variant}`;
+  if (disabled) {
+    return (
+      <span className={cls} aria-disabled="true">
+        <span className="saju-action-card__icon">{ICON[icon] || '✦'}</span>
+        <span className="saju-action-card__title">{title}</span>
+        <span className="saju-action-card__desc">{desc || '준비 중'}</span>
+      </span>
+    );
+  }
+  return (
+    <Link to={to} className={cls}>
+      <span className="saju-action-card__icon">{ICON[icon] || '✦'}</span>
+      <span className="saju-action-card__title">{title}</span>
+      <span className="saju-action-card__desc">{desc}</span>
+    </Link>
+  );
+}

src/pages/saju/components/SajuInputForm.jsx

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+import React from 'react';
+
+export default function SajuInputForm({ form, onChange, onSubmit, loading, error }) {
+  return (
+    <form className="saju-form" onSubmit={onSubmit}>
+      <h3 className="saju-h3" style={{ color: 'var(--saju-cream)', marginBottom: '0.5rem' }}>
+        사주풀이 시작하기
+      </h3>
+      <input
+        type="text"
+        placeholder="이름 (선택)"
+        value={form.name}
+        onChange={(e) => onChange('name', e.target.value)}
+        disabled={loading}
+      />
+      <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr 1fr', gap: '0.5rem' }}>
+        <input type="number" placeholder="년 (1900-2100)" value={form.year}
+               onChange={(e) => onChange('year', e.target.value)} disabled={loading} min="1900" max="2100" />
+        <input type="number" placeholder="월" value={form.month}
+               onChange={(e) => onChange('month', e.target.value)} disabled={loading} min="1" max="12" />
+        <input type="number" placeholder="일" value={form.day}
+               onChange={(e) => onChange('day', e.target.value)} disabled={loading} min="1" max="31" />
+      </div>
+      <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr 1fr', gap: '0.5rem' }}>
+        <input type="number" placeholder="시 (선택, 0-23)" value={form.hour}
+               onChange={(e) => onChange('hour', e.target.value)} disabled={loading} min="0" max="23" />
+        <select value={form.gender} onChange={(e) => onChange('gender', e.target.value)} disabled={loading}>
+          <option value="male">남</option>
+          <option value="female">여</option>
+        </select>
+        <select value={form.calendar_type} onChange={(e) => onChange('calendar_type', e.target.value)} disabled={loading}>
+          <option value="solar">양력</option>
+          <option value="lunar">음력</option>
+        </select>
+      </div>
+      {error && <div className="saju-form__error">{error}</div>}
+      <button type="submit" disabled={loading}>
+        {loading ? '호령이 풀어보는 중...' : '사주풀이 시작하기 ✦'}
+      </button>
+    </form>
+  );
+}

src/pages/saju/hooks/useSajuForm.js

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+import { useState, useCallback } from 'react';
+import { useNavigate } from 'react-router-dom';
+import { sajuInterpret } from '../../../api';
+
+const INITIAL_FORM = {
+  name: '',
+  year: '',
+  month: '',
+  day: '',
+  hour: '',
+  gender: 'male',
+  calendar_type: 'solar',
+};
+
+export default function useSajuForm() {
+  const [form, setForm] = useState(INITIAL_FORM);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState(null);
+  const navigate = useNavigate();
+
+  const handleChange = useCallback((field, value) => {
+    setForm((prev) => ({ ...prev, [field]: value }));
+  }, []);
+
+  const handleSubmit = useCallback(async (e) => {
+    if (e?.preventDefault) e.preventDefault();
+    setError(null);
+
+    if (!form.year || !form.month || !form.day) {
+      setError('생년월일을 모두 입력해주세요.');
+      return;
+    }
+    const year = parseInt(form.year, 10);
+    const month = parseInt(form.month, 10);
+    const day = parseInt(form.day, 10);
+    if (year < 1900 || year > 2100 || month < 1 || month > 12 || day < 1 || day > 31) {
+      setError('올바른 생년월일을 입력해주세요.');
+      return;
+    }
+
+    setLoading(true);
+    try {
+      const body = {
+        year,
+        month,
+        day,
+        gender: form.gender,
+        calendar_type: form.calendar_type,
+      };
+      if (form.hour !== '') {
+        body.hour = parseInt(form.hour, 10);
+      }
+      const result = await sajuInterpret(body);
+      navigate(`/saju/result?rid=${result.reading_id}`);
+    } catch (err) {
+      console.error('사주 분석 실패', err);
+      setError(err.message || '잠시 후 다시 시도해주세요.');
+    } finally {
+      setLoading(false);
+    }
+  }, [form, navigate]);
+
+  return { form, handleChange, handleSubmit, loading, error };
+}