fix: repair invite links, social features, messaging + Discord UI overhaul

Phase 1 - Feature Repair:
- Fix member kick/leave: add missing db.delete() call in servers.ts
- Stabilize invite codes: return existing code instead of regenerating
- Fix user search: use LIKE instead of exact match in social.ts
- Wire DM button on FriendsPage to create/navigate to DM channels
- Add cancel outgoing friend request (DELETE endpoint + frontend)
- Add accept/decline friend request actions with WS real-time events
- Fix replyToId persistence in message creation
- Hydrate reactions and replyTo in message queries
- Add joinByCode to API client and serverStore
- Add friend_request_received/accepted WebSocket events

Phase 2 - Discord UI Overhaul:
- Remove stray borders between layout columns
- Replace shadow-sm with shadow-header on content headers
- Replace all bg-gray-*/text-gray-* with Discord color tokens
- Ensure flat color contrast (#1E1F22, #2B2D31, #313338)

Testing:
- Set up vitest + @testing-library/react + jsdom
- Add 17 tests across InviteModal, JoinServer, FriendsPage (all passing)
- Fix vite resolve.extensions to prefer .tsx over stale .js files

Makefile

@@ -0,0 +1,30 @@
+# Raspberry Pi Deployment Makefile (Direct SSH)
+
+PI_IP = 192.168.1.10
+PI_USER = youruser
+REMOTE_PATH = ~/opencord
+
+.PHONY: deploy logs shell env status
+
+# Full deployment: sync code and rebuild/restart containers ON the Pi
+deploy:
+	@chmod +x deploy.sh
+	./deploy.sh
+
+# Watch real-time logs FROM the Pi server
+logs:
+	ssh $(PI_USER)@$(PI_IP) "cd $(REMOTE_PATH) && docker compose logs -f"
+
+# Drop into a shell inside the running container ON the Pi
+shell:
+	ssh -t $(PI_USER)@$(PI_IP) "docker exec -it opencord /bin/bash"
+
+# Push local .env to the Pi (do this once)
+env:
+	@echo "📤 Pushing .env to Pi..."
+	ssh $(PI_USER)@$(PI_IP) "mkdir -p $(REMOTE_PATH)"
+	scp .env $(PI_USER)@$(PI_IP):$(REMOTE_PATH)/.env
+
+# Check container status ON the Pi
+status:
+	ssh $(PI_USER)@$(PI_IP) "cd $(REMOTE_PATH) && docker compose ps"