Fix products, search, and newsletter form per REPA-17

- Search: replace static <a href="/?s="> with togglable search overlay
  form that submits post_type=product for proper WooCommerce results
- Newsletter: remove mc4wp shortcode (plugin not installed), replace
  with self-contained HTML form + JS confirmation handler
- Shop by Design: link each design card to real product_tag pages
  (passive-aggressive, email-signatures, meeting-recovery, etc.)
  and show live tag.count instead of hardcoded numbers
- Category slugs: update $cat_meta mapping to match actual WC slugs
  (drinkware, wall-decor, stationery, apparel, stickers, accessories)
  in both front-page.php and archive-product.php
- Footer dept links updated to real WC category slugs

Co-Authored-By: Paperclip <noreply@paperclip.ing>

theme/woocommerce/archive-product.php

@@ -15,10 +15,12 @@ $cat_slug   = $is_category ? $term->slug : 'shop';
 
 // Category descriptions
 $cat_desc_map = [
-    'mugs'     => '47 ceramics, 12 enamels, and a few we honestly forgot to count. Dishwasher safe. Microwave safe. HR safe (mostly).',
-    'canvas'   => 'Print-on-demand wall art for the soul-tired and decoratively passive-aggressive.',
-    'planners' => 'For the person who plans a lot and does a little. Or the other way around.',
-    'apparel'  => 'Wear your grievances. Business casual with a quiet fury.',
+    'drinkware'   => 'Dishwasher safe. Microwave safe. HR safe (mostly). Mugs, tumblers, and vessels for the passively aggressive.',
+    'wall-decor'  => 'Print-on-demand wall art for the soul-tired and decoratively passive-aggressive.',
+    'stationery'  => 'For the person who plans a lot and does a little. Or the other way around.',
+    'apparel'     => 'Wear your grievances. Business casual with a quiet fury.',
+    'stickers'    => 'Stick your opinions where they'll be seen. Water-resistant, like your resolve.',
+    'accessories' => 'The extras that speak for you when you've run out of words.',
 ];
 if (empty($cat_desc)) {
     $cat_desc = $cat_desc_map[$cat_slug] ?? 'The complete collection. Curated for the chronically employed.';