# Code Generation Summary — Unit 2: Frontend Dual-Instance Tooling & Runbook

## Created

- `frontend/.env.slave.local` — `VITE_API_BASE_URL=https://localhost:7222`, `VITE_APP_TITLE=SlpModularCms (Slave)` (gitignored via existing `frontend/.gitignore` `*.local` pattern, verified via `git check-ignore`)
- `aidlc-docs/features/local-dev-master-slave-setup/construction/unit-2-frontend-dual-instance-tooling/code/summary.md` (this file)

## Modified

- `frontend/.env.example` — added a documented block explaining how to create `.env.slave.local` and use `pnpm dev:slave`, and how `VITE_APP_TITLE` distinguishes tabs
- `frontend/.env.local` (developer's existing local file, gitignored) — added `VITE_APP_TITLE=SlpModularCms (Master)` for symmetry with the slave
- `frontend/package.json` — added `"dev:slave": "vite --mode slave --port 5174"` script
- `frontend/src/vite-env.d.ts` — added optional `VITE_APP_TITLE` to the typed env interface
- `frontend/src/lib/config.ts` — added `appTitle` to `AppConfig`, sourced from `VITE_APP_TITLE` with a `'SlpModularCms'` fallback when unset
- `frontend/src/main.tsx` — sets `document.title` from `getAppConfig().appTitle` at startup, so each instance's browser tab is recognizable
- `README.md` (root) — added new section **"Lokaal Master + Slave Draaien (Dev)"** after "Master CMS Module", covering: starting both backends, starting the frontend against either instance, and using the existing "Add CMS Instance" dialog to connect them

## Notes

- No new tests — this unit is env/config/documentation only, no testable logic.
- `pnpm dev:slave` uses Vite's `--mode slave` flag, which loads `.env.slave.local` in addition to the default `.env`/`.env.local` files; `--port 5174` overrides `vite.config.ts`'s default port (5173) for this invocation only.
- **Added after initial Build and Test review** (user request): distinguishable browser tab titles per instance via `VITE_APP_TITLE`, defaulting to `"SlpModularCms"` so existing setups without the var keep today's title unchanged.
- Full end-to-end verification (starting both backends with real local databases, running both frontends, and confirming the "Add CMS Instance" flow actually connects them) is performed in Build and Test, since it requires a running local SQL Server instance that isn't available in this automated environment.

## Verification Performed (Tab Title Change)

- `pnpm build` (tsc -b + vite build) — succeeds, no type errors.
- `pnpm test` — 208/209 pass; the 1 failure (`AddCmsInstanceDialog.test.tsx`, a findByTestId timeout) reproduced as flaky under this session's load and passed 5/5 when re-run in isolation — unrelated to the title change (no title-related assertions, and `main.tsx` is not exercised by component tests).