feat(dashboard): auto-refresh after sync, configurable polling, extra filters

- Detect missed sync completions via last_run.run_id comparison
- Load polling interval from settings (dashboard_poll_seconds, default 5s)
- Add 1min/3min scheduler interval options
- Add 1zi/2zile period filter options
- New Dashboard settings card for polling interval

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/templates/settings.html

@@ -123,6 +123,21 @@
     </div>
 </div>
 
+<div class="row g-3 mb-3">
+    <div class="col-md-6">
+        <div class="card h-100">
+            <div class="card-header py-2 px-3 fw-semibold">Dashboard</div>
+            <div class="card-body py-2 px-3">
+                <div class="mb-2">
+                    <label class="form-label mb-0 small">Interval polling (secunde)</label>
+                    <input type="number" class="form-control form-control-sm" id="settDashPollSeconds" value="5" min="1" max="300">
+                    <div class="form-text" style="font-size:0.75rem">Cât de des verifică dashboard-ul starea sync-ului (implicit 5s)</div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
 <div class="mb-3">
     <button class="btn btn-primary btn-sm" onclick="saveSettings()">Salvează Setările</button>
     <span id="settSaveResult" class="ms-2 small"></span>
@@ -131,5 +146,5 @@
 {% endblock %}
 
 {% block scripts %}
-<script src="{{ request.scope.get('root_path', '') }}/static/js/settings.js?v=2"></script>
+<script src="{{ request.scope.get('root_path', '') }}/static/js/settings.js?v=3"></script>
 {% endblock %}