feat(v1.6): inline status change on orders list

Phase 44 complete:
- Clickable status badge opens dropdown with grouped statuses
- AJAX POST changes status without page reload (optimistic update)
- Fixed-position dropdown escapes table overflow:hidden
- updateStatus() returns JSON for AJAX, redirect for standard POST

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

resources/scss/app.scss

@@ -1082,6 +1082,66 @@ h4.section-title {
   align-items: center;
   gap: 5px;
   flex-wrap: wrap;
+  cursor: pointer;
+
+  .order-tag {
+    cursor: pointer;
+  }
+}
+
+.orders-status-dropdown {
+  position: fixed;
+  z-index: 9999;
+  min-width: 180px;
+  max-height: 280px;
+  overflow-y: auto;
+  background: #fff;
+  border: 1px solid #d8e1ef;
+  border-radius: 6px;
+  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
+  padding: 4px 0;
+
+  &__group-header {
+    padding: 6px 12px 2px;
+    font-size: 10px;
+    font-weight: 700;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    color: #94a3b8;
+
+    &:not(:first-child) {
+      border-top: 1px solid #f1f5f9;
+      margin-top: 2px;
+      padding-top: 8px;
+    }
+  }
+
+  &__item {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    padding: 5px 12px;
+    font-size: 13px;
+    color: #334155;
+    cursor: pointer;
+    white-space: nowrap;
+
+    &:hover {
+      background: #f1f5f9;
+    }
+
+    &.is-current {
+      font-weight: 700;
+      background: #f8fafc;
+    }
+  }
+
+  &__color-dot {
+    width: 10px;
+    height: 10px;
+    border-radius: 50%;
+    flex-shrink: 0;
+  }
 }
 
 .order-tag {