Add band and venue follows with concert diary

app/templates/concert_detail.html

@@ -25,6 +25,14 @@
         .flyer-source { display: block; width: 100%; flex: 0 0 100%; margin: 10px 0 0; color: #a8a29e; font-size: .85rem; text-align: center; }
         .flyer-source a { color: #f87171; text-decoration: underline; }
         .flyer-disclaimer { display: block; margin-top: 4px; font-size: .75rem; }
+        .follow-actions { display:flex; flex-wrap:wrap; justify-content:center; gap:8px; margin:0 0 20px; }
+        .follow-actions form { margin:0; }
+        .follow-button { padding:8px 11px; color:#fca5a5; background:#171212; border:1px solid var(--border); border-radius:9px; cursor:pointer; }
+        .follow-button.is-following { color:#fff; border-color:#dc2626; background:#7f1d1d; }
+        .diary-section { margin-top:26px; padding-top:22px; border-top:1px solid var(--border); }
+        .diary-form { max-width:none; }
+        .diary-form select, .diary-form input, .diary-form textarea { width:100%; }
+        .diary-form textarea { min-height:130px; resize:vertical; }
     </style>
 
 </head>
@@ -70,6 +78,19 @@
                 {{ concert.artist }}
             </h1>
 
+            <div class="follow-actions" id="following">
+                {% for band in concert_bands %}<form method="post" action="/concerts/{{ concert.id }}/follow-band">
+                    <input type="hidden" name="band_key" value="{{ band.key }}">
+                    <input type="hidden" name="action" value="{% if band.is_following %}unfollow{% else %}follow{% endif %}">
+                    <button class="follow-button {% if band.is_following %}is-following{% endif %}" type="submit">{% if band.is_following %}★ {{ band.name }} gefolgt{% else %}☆ {{ band.name }} folgen{% endif %}</button>
+                </form>{% endfor %}
+                {% if concert.venue.id %}<form method="post" action="/concerts/{{ concert.id }}/follow-venue">
+                    <input type="hidden" name="action" value="{% if follows_venue %}unfollow{% else %}follow{% endif %}">
+                    <button class="follow-button {% if follows_venue %}is-following{% endif %}" type="submit">{% if follows_venue %}★ Location gefolgt{% else %}☆ Location folgen{% endif %}</button>
+                </form>{% endif %}
+                <a class="follow-button" href="/following">Meine gefolgten Inhalte</a>
+            </div>
+
 
             <div class="concert-info">
 
@@ -366,6 +387,29 @@
 
             {% endif %}
 
+            {% if concert.is_past %}
+                <section class="diary-section" id="diary">
+                    <h2>📓 Mein Konzerttagebuch</h2>
+                    {% if can_write_diary %}
+                        <p>Dieser Eintrag ist privat und nur für dich sichtbar.</p>
+                        <form class="diary-form" method="post" action="/concerts/{{ concert.id }}/diary">
+                            <label for="diary-rating">Bewertung</label>
+                            <select id="diary-rating" name="rating" required>
+                                {% for value in range(1, 6) %}<option value="{{ value }}" {% if diary_entry and diary_entry.rating == value %}selected{% endif %}>{{ value }} von 5 Sternen</option>{% endfor %}
+                            </select>
+                            <label for="favorite-song">Lieblingssong <small>(optional)</small></label>
+                            <input id="favorite-song" name="favorite_song" maxlength="255" value="{{ diary_entry.favorite_song if diary_entry else '' }}">
+                            <label for="diary-notes">Erinnerungen <small>(optional)</small></label>
+                            <textarea id="diary-notes" name="notes" maxlength="5000" placeholder="Was ist dir von diesem Abend geblieben?">{{ diary_entry.notes if diary_entry else '' }}</textarea>
+                            <button class="attendance-option" type="submit">{% if diary_entry %}Eintrag aktualisieren{% else %}Im Tagebuch speichern{% endif %}</button>
+                        </form>
+                        {% if diary_entry %}<form method="post" action="/concerts/{{ concert.id }}/diary/delete" onsubmit="return confirm('Tagebucheintrag wirklich löschen?');"><button class="button button-secondary" type="submit">Tagebucheintrag löschen</button></form>{% endif %}
+                    {% else %}
+                        <p>Das private Tagebuch ist verfügbar, wenn du dieses vergangene Konzert als „Zugesagt“ markiert hattest.</p>
+                    {% endif %}
+                </section>
+            {% endif %}
+
             <section class="comments-section" id="comments">
 
                 <h2>💬 Kommentare</h2>