Add help FAQ modal and i18n help content

wwwroot/css/components.css

@@ -114,6 +114,16 @@ button .chip {
     border-color: #a83a35;
 }
 
+.help-chip {
+    background: #dff3ff;
+    border-color: #b6ddff;
+    color: #0f3a6f;
+    font-weight: 700;
+}
+.help-chip:hover {
+    background: #cde8ff;
+}
+
 .nav-btn {
     min-width: 64px;
     font-weight: 700;

wwwroot/css/modals.css

@@ -76,3 +76,41 @@
 .preview-card {
     pointer-events: none;
 }
+
+.faq-panel .faq-list {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+.faq-intro {
+    margin-top: 0;
+    margin-bottom: 12px;
+    color: #5b4a32;
+}
+.faq-section {
+    border: 1px solid #e3d4bd;
+    border-radius: 10px;
+    padding: 8px 10px;
+    background: #fff7ec;
+}
+.faq-section > summary {
+    font-weight: 700;
+    cursor: pointer;
+}
+.faq-items {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+    padding-top: 6px;
+    margin-left: 6px;
+}
+.faq-item {
+    border: 1px solid #eedec3;
+    border-radius: 8px;
+    padding: 6px 8px;
+    background: #ffffff;
+}
+.faq-item > summary {
+    font-weight: 600;
+    cursor: pointer;
+}