chore: adjust main window size and fix titlebar overlay

- Increase default main window size from 1320x860 to 1420x960
- Use transparent titlebar overlay for all window modes
- Remove hardcoded CONFIG_PATH from dev-ops-api make target

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/Makefile

@@ -26,7 +26,7 @@ dev-scheduler: ## Run scheduler workers
 	go run ./cmd/scheduler
 
 dev-ops-api: ## Run ops-api server (internal operations console backend)
-	CONFIG_PATH=configs/ops-config.yaml go run ./cmd/ops-api
+	go run ./cmd/ops-api
 
 migrate-up: ## Run all pending migrations
 	$(MIGRATE_CMD) -path migrations -database "$(DB_URL)" up