feat(portal): season thumbnails in the season dropdown + PR #1628 follow-ups (#1633)

* feat(portal): season thumbnails in the season dropdown + PR #1628 follow-ups

Follow-ups to the season posters shipped in #1628:

- The >6-seasons dropdown (`SeasonTabsComponent`) now carries a 28×42
  season thumbnail at the start of each menu row that has a poster and in
  the closed trigger for the selected season, fed by a new `seasonPosters`
  input from the season container and the fullscreen episode panel. Rows
  without a poster get no placeholder, a failed image is dropped, and the
  pill row stays text-only as the design review decided.
- The fullscreen season strip's episode count uses its own
  `PORTALS.EPISODE_COUNT_ONE/OTHER` keys instead of borrowing the download
  manager's; all 18 locales filled through the i18n merger from their
  existing `DOWNLOADS.EPISODE_COUNT_*` translations.
- The Stalker mock's serve targets no longer pin `PORT` (an nx:run-commands
  `env` entry overrides the shell), and `main.ts` resolves `PORT`, then the
  Playwright-side `MOCK_PORT` alias, then 3210 — so `MOCK_PORT=3310` now
  relocates the whole E2E run. The Xtream mock honours `XTREAM_MOCK_PORT`
  the same way.
- `resolveAutoSelectedSeason` gets a direct spec covering every branch.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* fix(xtream-mock): mint marketing asset URLs on the port the server bound

Greptile P1 on #1633: the listener honoured `XTREAM_MOCK_PORT`, but
`marketingAssetOrigin()` still read `PORT` alone, so a run relocated only
through the alias sent every poster/backdrop/logo/episode URL to 3211.

One resolver (`resolveXtreamMockPortString` in `mock-port.ts`: `PORT`,
then `XTREAM_MOCK_PORT`, then 3211) now feeds the environment parser, the
marketing asset origin and the demo-guide origin fallback. A spec pins the
precedence and that `marketingAssetUrl` follows the bound port.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

apps/web-e2e/playwright.config.ts

@@ -52,11 +52,12 @@ export default defineConfig({
     /* Run local dev servers before starting the tests.
      * Both the Angular app and the Stalker mock server start in parallel.
      *
-     * MOCK_PORT only moves where the CLIENT looks — this health check and the
-     * specs' MOCK_SERVER constants. The mock reads PORT, which
-     * stalker-mock-server's serve target pins to 3210, and nothing maps one to
-     * the other, so MOCK_PORT alone makes the wait below time out. Use it to
-     * point at a mock you started yourself on that port.
+     * MOCK_PORT / XTREAM_MOCK_PORT relocate a mock for the whole run: the
+     * health checks below and the specs' MOCK_SERVER constants read them, and
+     * both mock servers honour them as a fallback for PORT (their serve
+     * targets no longer pin PORT, so an explicit shell value reaches the
+     * process). That is what lets two worktrees run E2E side by side when one
+     * already holds 3210/3211.
      */
     webServer: [
         {