Feat v0.5.2 chat surface

Chat surface package (packages/chat/) with conversation list, message
thread, compose bar, participant sidebar, create conversation dialog,
typing indicators, read receipts, message editing, and message deletion.
Built on chat-core library with realtime event subscriptions.

Fix stale token login deadlock: REST client auth endpoints excluded
from 401 retry loop, 8s defensive boot timeout on auth.boot().

Fix bundled package permissions: auto-grant with NULL granted_by and
set status active on install.

Switch docker-compose to named volume for remote Docker host compat.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -7,8 +7,8 @@
 #   docker compose up --build
 #   open http://localhost:3000
 #
-# Data persists in ./data/ between restarts.
-# To reset: rm -rf ./data/
+# Data persists in the `sb_data` named volume between restarts.
+# To reset: docker compose down -v
 #
 # For Postgres / multi-replica / k8s deployment see k8s/ and Dockerfile.
 
@@ -37,7 +37,10 @@ services:
       # Dev seed users — ignored if ENVIRONMENT=production
       SEED_USERS: ${SEED_USERS:-alice:password123:user,bob:password456:user,charlie:password789:user}
     volumes:
-      - ./data:/data
+      - sb_data:/data
     ports:
       - "3000:80"
     restart: unless-stopped
+
+volumes:
+  sb_data: