fix: WP-Admin CSS conflicts and add-to-cart redirect

- Fix CSS conflicts between WP-Admin and SPA (radio buttons, chart text)
- Add Tailwind important selector scoped to #woonoow-admin-app
- Remove overly aggressive inline SVG styles from Assets.php
- Add targeted WordPress admin CSS overrides in index.css
- Fix add-to-cart redirect to use woocommerce_add_to_cart_redirect filter
- Let WooCommerce handle cart operations natively for proper session management
- Remove duplicate tailwind.config.cjs

admin-spa/src/index.css

@@ -76,6 +76,43 @@
   }
 }
 
+/* ============================================
+   WordPress Admin Override Fixes
+   These rules use high specificity + !important 
+   to override WordPress admin CSS conflicts
+   ============================================ */
+
+/* Fix SVG icon styling - WordPress sets fill:currentColor on all SVGs */
+#woonoow-admin-app svg {
+  fill: none !important;
+}
+
+/* But allow explicit fill-current class to work for filled icons */
+#woonoow-admin-app svg.fill-current,
+#woonoow-admin-app .fill-current svg,
+#woonoow-admin-app [class*="fill-"] svg {
+  fill: currentColor !important;
+}
+
+/* Fix radio button indicator - WordPress overrides circle fill */
+#woonoow-admin-app [data-radix-radio-group-item] svg,
+#woonoow-admin-app [role="radio"] svg {
+  fill: currentColor !important;
+}
+
+/* Fix font-weight inheritance - prevent WordPress bold overrides */
+#woonoow-admin-app text,
+#woonoow-admin-app tspan {
+  font-weight: inherit !important;
+}
+
+/* Reset form element styling that WordPress overrides */
+#woonoow-admin-app input[type="radio"],
+#woonoow-admin-app input[type="checkbox"] {
+  appearance: none !important;
+  -webkit-appearance: none !important;
+}
+
 /* Command palette input: remove native borders/shadows to match shadcn */
 .command-palette-search {
   border: none !important;