Add accounts, presets, live sheet panel and equipment tiles

- Login with registration code, sessions, rate limiting, per-user characters
- Share characters with other users (read-only), admin CLI
- Rules presets with a Presets tab, applied/pending changes with diff in a side sheet
- Equipment as tiles with amounts, starting kit removed
- Rename nav tab to "Character", add "New character" button
- Stop tracking _to_delete/

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HJhXuLD2Z6hv3Wqeq9UL9K

backend/app/derive.py

@@ -2,20 +2,17 @@
 
 
 def kit_items(ch: dict, rules: dict) -> list:
-    """Returns [(label, item, qty)] for the starting kit and extra items."""
+    """Returns [(category, item, qty)] for the carried items. Old starting-kit slots count as one item each."""
     items = {e["id"]: e for e in rules.get("equipment", [])}
+    cats = {c["id"]: c["name"] for c in rules.get("equipment_categories", [])}
     kit = ch.get("kit") or {}
-    out = []
-    for label, key in (("Weapon", "weapon"), ("Armor", "armor"), ("Tool", "tool")):
-        if kit.get(key) in items:
-            out.append((label, items[kit[key]], 1))
-    for rid in kit.get("resources", []):
-        if rid in items:
-            out.append(("Resource", items[rid], 1))
-    for iid, qty in (kit.get("extras") or {}).items():
-        if iid in items and int(qty) > 0:
-            out.append(("Extra", items[iid], int(qty)))
-    return out
+    qty: dict = {}
+    for iid in [kit.get("weapon"), kit.get("armor"), kit.get("tool"), *(kit.get("resources") or [])]:
+        if iid:
+            qty[iid] = qty.get(iid, 0) + 1
+    for iid, n in (kit.get("extras") or {}).items():
+        qty[iid] = qty.get(iid, 0) + int(n)
+    return [(cats.get(items[i]["cat"], ""), items[i], n) for i, n in qty.items() if i in items and n > 0]
 
 
 def compute(ch: dict, rules: dict) -> dict: