feat: stat distribution UI + rest button + xpToNextLevel from backend

Dashboard: stat distributor with +/- buttons when statPoints > 0,
rest button (+50% HP, -20 endurance) when HP < max,
XP bar uses xpToNextLevel from backend instead of local formula.
API: distributeStats + rest endpoints added to client.

frontend/src/api/endpoints.ts

@@ -17,6 +17,9 @@ export const characterApi = {
   create: (name: string, stats: Record<string, number>) =>
     api.post<Character>('/characters', { name, ...stats }),
   me:     () => api.get<Character>('/characters/me'),
+  distributeStats: (stats: Record<string, number>) =>
+    api.post<Character>('/characters/stats', stats),
+  rest:   () => api.post<{ hpBefore: number; hpAfter: number; hpMax: number; healed: number }>('/characters/rest'),
 };
 
 // Combat

frontend/src/pages/DashboardPage.tsx

@@ -2,7 +2,7 @@ import { useState } from 'react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { characterApi } from '../api/endpoints';
 import { Bar } from '../components/Bar';
-import { Zap, Heart, Star, Coins, Sword, Shield } from 'lucide-react';
+import { Zap, Heart, Star, Coins, Sword, Shield, BedDouble } from 'lucide-react';
 
 const STATS = ['force', 'agilite', 'intelligence', 'chance', 'vitalite'] as const;
 const STAT_LABELS: Record<string, string> = {
@@ -73,17 +73,86 @@ function CreateCharacter() {
   );
 }
 
+function StatDistributor({ char }: { char: any }) {
+  const qc = useQueryClient();
+  const [pts, setPts] = useState<Record<string, number>>({ force: 0, agilite: 0, intelligence: 0, chance: 0, vitalite: 0 });
+  const used = Object.values(pts).reduce((a, b) => a + b, 0);
+  const remaining = (char.statPoints ?? 0) - used;
+
+  const mut = useMutation({
+    mutationFn: () => characterApi.distributeStats(pts),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['character'] });
+      setPts({ force: 0, agilite: 0, intelligence: 0, chance: 0, vitalite: 0 });
+    },
+  });
+
+  const adjust = (stat: string, delta: number) => {
+    const next = (pts[stat] ?? 0) + delta;
+    if (next < 0) return;
+    if (delta > 0 && remaining <= 0) return;
+    setPts(p => ({ ...p, [stat]: next }));
+  };
+
+  return (
+    <div className="card card-gold">
+      <p style={{ margin: '0 0 0.5rem', fontSize: 13, fontWeight: 700, color: '#f4c94e' }}>
+        Répartir {char.statPoints} point{char.statPoints > 1 ? 's' : ''} de stats
+      </p>
+      <p style={{ margin: '0 0 0.75rem', fontSize: 11, color: '#6b7a99' }}>
+        {remaining > 0 ? `${remaining} restant${remaining > 1 ? 's' : ''}` : 'Prêt à valider'}
+      </p>
+
+      <div style={{ display: 'flex', flexDirection: 'column', gap: 6, marginBottom: '0.75rem' }}>
+        {STATS.map(s => (
+          <div key={s} style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
+            <span style={{ fontSize: 12, color: '#dce4f0', width: 100 }}>
+              {STAT_LABELS[s]} <span style={{ color: '#6b7a99' }}>({char[s]})</span>
+            </span>
+            <div style={{ display: 'flex', alignItems: 'center', gap: 6 }}>
+              <button className="btn btn-ghost" style={{ padding: '0.1rem 0.4rem', fontSize: 13 }} onClick={() => adjust(s, -1)} disabled={pts[s] <= 0}>−</button>
+              <span style={{ width: 20, textAlign: 'center', fontWeight: 700, color: pts[s] > 0 ? '#3ddc84' : '#6b7a99', fontSize: 13 }}>
+                {pts[s] > 0 ? `+${pts[s]}` : '0'}
+              </span>
+              <button className="btn btn-ghost" style={{ padding: '0.1rem 0.4rem', fontSize: 13 }} onClick={() => adjust(s, +1)} disabled={remaining <= 0}>+</button>
+            </div>
+          </div>
+        ))}
+      </div>
+
+      <button
+        className="btn btn-gold"
+        style={{ width: '100%', fontSize: 13 }}
+        disabled={used === 0 || mut.isPending}
+        onClick={() => mut.mutate()}
+      >
+        {mut.isPending ? 'Application…' : `Valider (+${used} pts)`}
+      </button>
+
+      {mut.isError && <p style={{ color: '#e84040', fontSize: 11, marginTop: 6 }}>{(mut.error as Error).message}</p>}
+    </div>
+  );
+}
+
 export function DashboardPage() {
+  const qc = useQueryClient();
   const { data: char, isLoading, isError } = useQuery({
     queryKey: ['character'],
     queryFn: characterApi.me,
     retry: 1,
   });
 
+  const restMut = useMutation({
+    mutationFn: () => characterApi.rest(),
+    onSuccess: () => qc.invalidateQueries({ queryKey: ['character'] }),
+  });
+
   if (isLoading) return <div style={{ padding: '2rem', color: '#6b7a99' }}>Chargement…</div>;
   if (isError || !char) return <CreateCharacter />;
 
-  const xpNext = Math.round(100 * Math.pow(char.level, 1.5));
+  const xpNext = (char as any).xpToNextLevel ?? Math.round(100 * Math.pow(char.level, 1.5));
+  const statPoints = (char as any).statPoints ?? 0;
+  const needsHeal = char.hpCurrent < char.hpMax;
 
   return (
     <div>
@@ -102,8 +171,8 @@ export function DashboardPage() {
             <span style={{ fontSize: 12, color: '#6b7a99', display: 'flex', alignItems: 'center', gap: 4 }}>
               <Star size={12} color="#a78bfa" /> {char.xp} / {xpNext} XP
             </span>
-            {(char as any).statPoints > 0 && (
-              <span className="badge badge-gold">+{(char as any).statPoints} pts à répartir</span>
+            {statPoints > 0 && (
+              <span className="badge badge-gold">+{statPoints} pts à répartir</span>
             )}
           </div>
         </div>
@@ -141,6 +210,18 @@ export function DashboardPage() {
               </div>
               <Bar value={char.xp} max={xpNext} type="xp" showValues={false} />
             </div>
+            {needsHeal && (
+              <button
+                className="btn btn-ghost"
+                style={{ marginTop: 4, fontSize: 12, display: 'flex', alignItems: 'center', gap: 6, justifyContent: 'center' }}
+                disabled={restMut.isPending}
+                onClick={() => restMut.mutate()}
+              >
+                <BedDouble size={13} />
+                {restMut.isPending ? 'Repos…' : 'Se reposer (+50% PV, -20 endurance)'}
+              </button>
+            )}
+            {restMut.isError && <p style={{ color: '#e84040', fontSize: 11, marginTop: 2 }}>{(restMut.error as Error).message}</p>}
           </div>
         </div>
 
@@ -161,6 +242,13 @@ export function DashboardPage() {
           </div>
         </div>
 
+        {/* Distributeur de stats */}
+        {statPoints > 0 && (
+          <div style={{ gridColumn: '1 / -1' }}>
+            <StatDistributor char={char} />
+          </div>
+        )}
+
         {/* Équipement résumé */}
         <div className="card" style={{ gridColumn: '1 / -1' }}>
           <p style={{ margin: '0 0 0.75rem', fontSize: 13, fontWeight: 700, color: '#9ca3af' }}>Combat actuel</p>