test(e2e): golden-master Playwright net for the Platform refactor

Locks the five flows the refactor must not break (feed, channel, player, settings, nav) so later sprints can prove they changed nothing. Adds a thin data-testid layer and a dedicated seeded non-demo account; the suite runs on the baked :8080 stack (authoritative) or :5173. No product-behaviour change.
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+# E2E characterization (golden-master) net
+
+Playwright tests that lock the app's five core flows — **feed** (scroll + filter), **channel**
+(open → back), **player** (open/close), **settings** (dirty-save + guard), and **page switching** —
+so the Platform refactor can *prove* it changed nothing. They assert current, correct behavior;
+they deliberately do **not** encode the known Platform bugs (those get their own specs when the
+sprints that fix them land).
+
+## Run
+
+```sh
+siftlode e2e            # against the baked localdev :8080 stack (authoritative)
+siftlode e2e-ui         # same, Playwright UI mode
+siftlode e2e-seed       # (re)seed the test account only, no tests
+```
+
+The localdev stack must be up (`siftlode dev`). `global.setup.ts` reseeds the account and logs in
+once, sharing the session via `e2e/.auth/state.json` (git-ignored).
+
+**Target** — `PW_BASE_URL` (default `http://127.0.0.1:8080`):
+
+- **`:8080`** (baked SPA) is authoritative and same-origin. After a **frontend change you must
+  `siftlode dev` (rebuild)** for its baked SPA to carry the latest test hooks.
+- **`:5173`** (Vite dev) serves source live — the fast refactor loop; it proxies `/api` to `:8080`,
+  so the stack must still be up. All five flows are proxy-safe (none use the WebSocket):
+
+  ```sh
+  PW_BASE_URL=http://localhost:5173 siftlode e2e
+  ```
+
+## Account & fixture
+
+Tests run as a dedicated, **non-demo** account `e2e@siftlode.local` (never a real account), reset to
+a deterministic baseline every run by [`scripts/e2e_seed.py`](../../scripts/e2e_seed.py) (run
+in-container so it reuses the app's models + argon2 hasher): the top-3 organic channels subscribed,
+one in-progress + one watched + one saved video, prefs pinned to `language: en`. Credentials come
+from `E2E_EMAIL` / `E2E_PASSWORD` (local-only defaults). Override the container name with
+`E2E_API_CONTAINER`; skip the in-container seed with `E2E_SKIP_SEED=1`.
+
+## Selectors
+
+The app has no `data-testid`s of its own and all copy is i18n (en/hu), so the specs key on a thin
+`data-testid` layer (added with this sprint) plus the locale pinned to `en`. Stable ARIA hooks that
+already existed are used directly (`role="dialog"` on the player, `aria-current="page"` on the
+active nav row, `aria-pressed` on the feed toggles).
+
+## Typecheck
+
+`npx tsc -p e2e/tsconfig.json --noEmit` (the specs are outside the app's `src` tsconfig).