Media pool: this project and all assets

This project lists every symbol in the document and the video it uses or was
given this session, each with a frame from its proxy as a thumbnail. All
assets lists every upload on the server and every other saved project's
symbols, from a new /api/symbols that reads symbol leaf paths. Every row is a
drag source (symbol:, import:, footage:). Uploading no longer runs straight
into detection; it lands in the project's media.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

clips/views.py

@@ -273,6 +273,44 @@ def footage_list(request):
     )
 
 
+_SYMBOL_LEAF = re.compile(r"^clip/([^/]+)/symbol/([^/]+)$")
+
+
+def _transit_fields(value, *keys):
+    """Top-level fields of a transit map leaf, by keyword name. A leaf's own
+    facts are a small flat map, so no key repeats and transit's cache never
+    stands in for one; anything else reads as absent."""
+    if not (isinstance(value, list) and value[:1] == ["^ "]):
+        return {}
+    pairs = dict(zip(value[1::2], value[2::2]))
+    return {k: pairs.get(f"~:{k}") for k in keys}
+
+
+@require_http_methods(["GET"])
+def symbols(request):
+    """Every symbol in every saved project, for the pool's all-assets folder.
+
+    Read off the leaf PATHS rather than by loading documents: a symbol's own leaf
+    is `clip/<cid>/symbol/<sid>`, so listing them is one query and no decoding
+    beyond the name and length its value carries."""
+    rows = []
+    for leaf in Leaf.objects.filter(path__contains="/symbol/").select_related("project"):
+        m = _SYMBOL_LEAF.match(leaf.path)
+        if not m:
+            continue
+        fields = _transit_fields(leaf.value, "name", "frames")
+        rows.append({
+            "project": str(leaf.project_id),
+            "project_name": leaf.project.name,
+            "cid": m.group(1),
+            "symbol": m.group(2),
+            "name": fields.get("name") or m.group(2).replace("~", "/"),
+            "frames": fields.get("frames"),
+        })
+    rows.sort(key=lambda r: (r["project_name"], r["project"], r["name"]))
+    return JsonResponse({"symbols": rows})
+
+
 @require_http_methods(["GET"])
 def footage_detail(request, footage_id):
     try: