Follow-up to #69205. After switching adev's COEP to `credentialless`, the
cross-origin YouTube iframe in `<docs-video>` loads in Chromium and Safari but
not Firefox, whose `credentialless` policy does not extend to nested frames. The
result was a COEP error screen instead of the player.
Render `<docs-video>` as a lightweight thumbnail facade instead of embedding the
iframe directly. The thumbnail is a cross-origin subresource, so it loads under
`credentialless` in every browser. `DocViewer` then upgrades the facade to the
inline player on hydration in browsers that can load the embed (Chromium,
Safari), preserving the previous behavior there. On Firefox the facade stays a
plain link that opens the video on YouTube (with autoplay), which replaces the
error screen.
The thumbnail uses `maxresdefault` and falls back to `hqdefault` when a video
has no max-resolution image.
Change direct deps in bazel targets and import specifiers within files to maintain strict deps requirements ahead of enabling strict deps tests in the repo
PR Close#63323
This will spare use the warning logs when the tests run.
```
NG0914: The application is using zoneless change detection, but is still loading Zone.js. Consider removing Zone.js to get the full benefits of zoneless. In applications using the Angular CLI, Zone.js is typically included in the "polyfills" section of the angular.json file.
```
PR Close#62596
Use the packaged versions of the packages instead of the local ts_project dependencies to prevent multiple versions of the deps to enter test bundles
PR Close#62413
To increase the ease of development we are moving @angular/docs into the adev directory within this repo. While
we are doing this to improve our development experience in the short term, efforts are also in place
to maintain a division between this @angular/docs (shared) code and adev itself, so that it can be extracted
back out in the future when components is ready to leverage it as well.
PR Close#57132
Kam