feat(website): surface subcategory labels as filterable tags

Entries nested under a plain-text subcategory heading (e.g. "Frameworks"
inside Testing) now carry a subcategory field populated by the parser.
The build pipeline collects these into a subcategories list on each merged
entry, and the template renders them as tag-subcat buttons that plug into
the existing data-cats filter mechanism.

A dedicated .tag-subcat style distinguishes them visually from category
tags, and both are hidden on mobile alongside .tag-group.

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

website/build.py

@@ -102,6 +102,9 @@ def extract_entries(
                     existing["categories"].append(cat["name"])
                 if group_name not in existing["groups"]:
                     existing["groups"].append(group_name)
+                subcat = entry["subcategory"]
+                if subcat and subcat not in existing["subcategories"]:
+                    existing["subcategories"].append(subcat)
             else:
                 merged = {
                     "name": entry["name"],
@@ -109,6 +112,7 @@ def extract_entries(
                     "description": entry["description"],
                     "categories": [cat["name"]],
                     "groups": [group_name],
+                    "subcategories": [entry["subcategory"]] if entry["subcategory"] else [],
                     "stars": None,
                     "owner": None,
                     "last_commit_at": None,

website/readme_parser.py

@@ -20,6 +20,7 @@ class ParsedEntry(TypedDict):
     url: str
     description: str  # inline HTML, properly escaped
     also_see: list[AlsoSee]
+    subcategory: str  # sub-category label, empty if none
 
 
 class ParsedSection(TypedDict):
@@ -178,7 +179,11 @@ def _extract_description_html(inline: SyntaxTreeNode, first_link: SyntaxTreeNode
     return _DESC_SEP_RE.sub("", html)
 
 
-def _parse_list_entries(bullet_list: SyntaxTreeNode) -> list[ParsedEntry]:
+def _parse_list_entries(
+    bullet_list: SyntaxTreeNode,
+    *,
+    subcategory: str = "",
+) -> list[ParsedEntry]:
     """Extract entries from a bullet_list AST node.
 
     Handles three patterns:
@@ -200,9 +205,10 @@ def _parse_list_entries(bullet_list: SyntaxTreeNode) -> list[ParsedEntry]:
 
         if first_link is None or not _is_leading_link(inline, first_link):
             # Subcategory label (plain text or text-before-link) — recurse into nested list
+            label = render_inline_text(inline.children)
             nested = _find_child(list_item, "bullet_list")
             if nested:
-                entries.extend(_parse_list_entries(nested))
+                entries.extend(_parse_list_entries(nested, subcategory=label))
             continue
 
         # Entry with a link
@@ -231,6 +237,7 @@ def _parse_list_entries(bullet_list: SyntaxTreeNode) -> list[ParsedEntry]:
             url=url,
             description=desc_html,
             also_see=also_see,
+            subcategory=subcategory,
         ))
 
     return entries

website/static/style.css

@@ -779,6 +779,12 @@ th[data-sort].sort-asc::after {
   color: var(--hero-ink);
 }
 
+.tag-subcat {
+  background: var(--bg-paper-strong);
+  color: var(--ink-soft);
+  font-weight: 600;
+}
+
 .back-to-top {
   border: 0;
   background: none;
@@ -991,7 +997,8 @@ th[data-sort].sort-asc::after {
     display: none;
   }
 
-  .tag-group {
+  .tag-group,
+  .tag-subcat {
     display: none;
   }
 

website/templates/index.html

@@ -121,7 +121,7 @@
         {% for entry in entries %}
         <tr
           class="row"
-          data-cats="{{ entry.categories | join('||') }}{% if entry.source_type == 'Built-in' %}||Built-in{% endif %}"
+          data-cats="{{ entry.categories | join('||') }}{% if entry.subcategories %}||{{ entry.subcategories | join('||') }}{% endif %}{% if entry.source_type == 'Built-in' %}||Built-in{% endif %}"
           data-groups="{{ entry.groups | join('||') }}"
           tabindex="0"
           aria-expanded="false"
@@ -160,6 +160,14 @@
             <button class="tag" data-type="cat" data-value="{{ cat }}">
               {{ cat }}
             </button>
+            {% endfor %} {% for subcat in entry.subcategories %}
+            <button
+              class="tag tag-subcat"
+              data-type="cat"
+              data-value="{{ subcat }}"
+            >
+              {{ subcat }}
+            </button>
             {% endfor %}
             <button
               class="tag tag-group"