feat: add GIF Mood Board workshop

- New workshop where each team member shares up to 5 GIFs with notes to express their weekly mood
- Per-user week rating (1-5 stars) visible next to each member's section
- Masonry-style grid with adjustable column count (3/4/5) toggle
- Handwriting font (Caveat) for GIF notes
- Full real-time collaboration via SSE
- Clean migration (add_gif_mood_workshop) safe for production deploy
- DB backup via cp before each migration in docker-entrypoint

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/gif-mood/new/page.tsx

@@ -0,0 +1,123 @@
+'use client';
+
+import { useState } from 'react';
+import { useRouter } from 'next/navigation';
+import {
+  Card,
+  CardHeader,
+  CardTitle,
+  CardDescription,
+  CardContent,
+  Button,
+  Input,
+} from '@/components/ui';
+import { createGifMoodSession } from '@/actions/gif-mood';
+import { GIF_MOOD_MAX_ITEMS } from '@/lib/types';
+
+export default function NewGifMoodPage() {
+  const router = useRouter();
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [selectedDate, setSelectedDate] = useState(new Date().toISOString().split('T')[0]);
+  const [title, setTitle] = useState(
+    () => `GIF Mood - ${new Date().toLocaleDateString('fr-FR', { day: 'numeric', month: 'long', year: 'numeric' })}`
+  );
+
+  async function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
+    e.preventDefault();
+    setError(null);
+    setLoading(true);
+
+    const date = selectedDate ? new Date(selectedDate) : undefined;
+
+    if (!title) {
+      setError('Veuillez remplir le titre');
+      setLoading(false);
+      return;
+    }
+
+    const result = await createGifMoodSession({ title, date });
+
+    if (!result.success) {
+      setError(result.error || 'Une erreur est survenue');
+      setLoading(false);
+      return;
+    }
+
+    router.push(`/gif-mood/${result.data?.id}`);
+  }
+
+  return (
+    <main className="mx-auto max-w-2xl px-4 py-8">
+      <Card>
+        <CardHeader>
+          <CardTitle className="flex items-center gap-2">
+            <span>🎭</span>
+            Nouveau GIF Mood Board
+          </CardTitle>
+          <CardDescription>
+            Créez un tableau de bord GIF pour exprimer et partager votre humeur avec votre équipe
+          </CardDescription>
+        </CardHeader>
+
+        <CardContent>
+          <form onSubmit={handleSubmit} className="space-y-6">
+            {error && (
+              <div className="rounded-lg border border-destructive/20 bg-destructive/10 p-3 text-sm text-destructive">
+                {error}
+              </div>
+            )}
+
+            <Input
+              label="Titre de la session"
+              name="title"
+              placeholder="Ex: GIF Mood - Mars 2026"
+              value={title}
+              onChange={(e) => setTitle(e.target.value)}
+              required
+            />
+
+            <div>
+              <label htmlFor="date" className="block text-sm font-medium text-foreground mb-1">
+                Date
+              </label>
+              <input
+                id="date"
+                name="date"
+                type="date"
+                value={selectedDate}
+                onChange={(e) => setSelectedDate(e.target.value)}
+                required
+                className="w-full rounded-lg border border-border bg-input px-3 py-2 text-foreground outline-none focus:border-primary focus:ring-2 focus:ring-primary/20"
+              />
+            </div>
+
+            <div className="rounded-lg border border-border bg-card-hover p-4">
+              <h3 className="font-medium text-foreground mb-2">Comment ça marche ?</h3>
+              <ol className="text-sm text-muted space-y-1 list-decimal list-inside">
+                <li>Partagez la session avec votre équipe</li>
+                <li>Chaque membre peut ajouter jusqu&apos;à {GIF_MOOD_MAX_ITEMS} GIFs</li>
+                <li>Ajoutez une note à chaque GIF pour expliquer votre humeur</li>
+                <li>Les GIFs apparaissent en temps réel pour tous les membres</li>
+              </ol>
+            </div>
+
+            <div className="flex gap-3 pt-4">
+              <Button
+                type="button"
+                variant="outline"
+                onClick={() => router.back()}
+                disabled={loading}
+              >
+                Annuler
+              </Button>
+              <Button type="submit" loading={loading} className="flex-1">
+                Créer le GIF Mood Board
+              </Button>
+            </div>
+          </form>
+        </CardContent>
+      </Card>
+    </main>
+  );
+}