phase 2: ui testing infrastructure

Vitest + @testing-library/jest-dom matchers wired through tests/setup.ts.
Playwright with four projects: chromium-desktop, webkit-desktop,
chromium-mobile-iphone-13, chromium-mobile-pixel-5; traces and
screenshots retained on failure.

.gitea/workflows/ui-test.yaml runs Tier 1 on every push and pull
request: monorepo Go service tests (backend with -p 1 to dodge
testcontainer contention; gateway, game, every pkg/<name> module),
pnpm install --frozen-lockfile, playwright install --with-deps,
pnpm test, pnpm exec playwright test. Uploads playwright-report
and test-results on failure. Integration suite stays gated behind
make -C integration integration; deprecated client/ excluded.

.gitea/workflows/ui-release.yaml mirrors Tier 1 on v* tag push and
keeps commented placeholders for visual regression (Phase 33) and
macOS iOS smoke (Phase 32).

ui/docs/testing.md documents both tiers and the local invocations
that mirror what CI runs. ui/PLAN.md Phase 2 marked done; Phase 3
gains a bullet to extend the go test command with ./ui/core/...;
Phase 36 has the renamed release workflow path.

tools/local-ci/ ships a self-contained docker-compose for verifying
workflows against a local Gitea + arm64 act_runner before pushing
to a real instance.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tools/local-ci/Makefile

@@ -0,0 +1,42 @@
+.PHONY: help up down logs status clean push
+
+.DEFAULT_GOAL := help
+
+COMPOSE     := docker compose
+GITEA_USER  := galaxy
+GITEA_PASS  := galaxy-dev
+REPO_NAME   := galaxy
+REMOTE_NAME := local-gitea
+REPO_ROOT   := $(realpath $(CURDIR)/../..)
+GIT         := git -C $(REPO_ROOT)
+REMOTE_URL  := http://$(GITEA_USER):$(GITEA_PASS)@localhost:3000/$(GITEA_USER)/$(REPO_NAME).git
+
+help:
+	@echo "Local Gitea CI for galaxy:"
+	@echo "  make up         Bring up Gitea + runner (idempotent)"
+	@echo "  make down       Stop both containers"
+	@echo "  make logs       Tail logs"
+	@echo "  make status     Show container status"
+	@echo "  make push       Push current branch to local Gitea"
+	@echo "  make clean      Stop and wipe all local state"
+
+up:
+	@./bootstrap.sh
+
+down:
+	$(COMPOSE) down
+
+logs:
+	$(COMPOSE) logs -f --tail=50
+
+status:
+	$(COMPOSE) ps
+
+push:
+	@$(GIT) remote get-url $(REMOTE_NAME) >/dev/null 2>&1 || \
+	    $(GIT) remote add $(REMOTE_NAME) $(REMOTE_URL)
+	$(GIT) push $(REMOTE_NAME) HEAD
+
+clean:
+	$(COMPOSE) down -v
+	rm -f .env