Store picker in topbar, redesign cabinet, rename to WBfeed.ru

- index.html: store dropdown in topbar (switch without leaving page)
- cabinet.html: store-cards with Активировать/Проверить, edit hidden in <details>
- Removed 'Используется' button, active shown as green card + label
- next=index param to return to main page after store switch
- Brand name changed to WBfeed.ru across all templates

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

static/styles.css

@@ -1847,3 +1847,146 @@ fieldset:disabled .filter-pill { pointer-events: none; opacity: 0.5; }
     font-weight: 700;
     margin-right: 6px;
 }
+
+/* ── Store picker (topbar dropdown) ─────────────────────── */
+.store-picker {
+    position: relative;
+}
+.store-picker__btn {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    padding: 6px 12px;
+    border-radius: var(--r-sm);
+    background: var(--line);
+    border: 1.5px solid var(--line-strong);
+    color: var(--text);
+    font-size: 13px;
+    font-weight: 500;
+    cursor: pointer;
+    box-shadow: none;
+    transition: background var(--t);
+    white-space: nowrap;
+    max-width: 180px;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+.store-picker__btn:hover { background: var(--line-strong); filter: none; transform: none; box-shadow: none; }
+.store-picker__dropdown {
+    display: none;
+    position: absolute;
+    top: calc(100% + 6px);
+    right: 0;
+    min-width: 200px;
+    background: #fff;
+    border: 1.5px solid var(--line);
+    border-radius: var(--r);
+    box-shadow: var(--shadow-md);
+    z-index: 300;
+    overflow: hidden;
+    padding: 6px;
+}
+.store-picker.open .store-picker__dropdown { display: block; }
+.store-picker__item {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 8px;
+    width: 100%;
+    padding: 9px 12px;
+    border-radius: var(--r-sm);
+    font-size: 13px;
+    font-weight: 500;
+    color: var(--text);
+    background: transparent;
+    border: none;
+    cursor: pointer;
+    text-decoration: none;
+    box-shadow: none;
+    transition: background var(--t);
+    text-align: left;
+}
+.store-picker__item:hover { background: var(--line); filter: none; transform: none; box-shadow: none; }
+.store-picker__item--active { color: var(--green); font-weight: 600; }
+.store-picker__sep { height: 1px; background: var(--line); margin: 4px 0; }
+
+/* ── Store cards (cabinet) ───────────────────────────────── */
+.store-list {
+    display: flex;
+    flex-direction: column;
+    gap: 12px;
+}
+.store-card {
+    border: 2px solid var(--line);
+    border-radius: var(--r);
+    padding: 18px 20px;
+    background: var(--card);
+    transition: border-color var(--t);
+}
+.store-card--active {
+    border-color: var(--green-line);
+    background: var(--green-bg);
+}
+.store-card__header {
+    display: flex;
+    align-items: center;
+    gap: 14px;
+}
+.store-card__icon {
+    width: 42px;
+    height: 42px;
+    border-radius: var(--r-sm);
+    background: var(--line);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    flex-shrink: 0;
+    color: var(--muted);
+}
+.store-card--active .store-card__icon {
+    background: var(--green-line);
+    color: var(--green);
+}
+.store-card__info { flex: 1; min-width: 0; }
+.store-card__name {
+    font-size: 15px;
+    font-weight: 600;
+    color: var(--text);
+}
+.store-card__active-label {
+    font-size: 12px;
+    font-weight: 600;
+    color: var(--green);
+    margin-top: 2px;
+    display: block;
+}
+.store-card__actions {
+    display: flex;
+    gap: 8px;
+    flex-shrink: 0;
+}
+.btn-activate {
+    background: linear-gradient(180deg, #22C55E 0%, #16A34A 100%);
+    color: #fff;
+    padding: 8px 16px;
+    font-size: 13px;
+    box-shadow: 0 2px 8px rgba(34,197,94,0.3);
+}
+.btn-activate:hover { opacity: 0.88; box-shadow: 0 4px 12px rgba(34,197,94,0.4); filter: none; }
+.store-card__edit {
+    margin-top: 14px;
+    padding-top: 14px;
+    border-top: 1px solid var(--line);
+}
+.store-card__edit summary {
+    font-size: 13px;
+    color: var(--muted);
+    cursor: pointer;
+    user-select: none;
+    list-style: none;
+}
+.store-card__edit summary:hover { color: var(--text); }
+.store-card__edit summary::marker,
+.store-card__edit summary::-webkit-details-marker { display: none; }
+.store-card__edit summary::before { content: '▸ '; font-size: 11px; }
+.store-card__edit[open] summary::before { content: '▾ '; }