Deprecate the Stimulus controllers shipped by the bundle

[Spomky]

Second step of the scope reduction announced in #372, independent from #455 which covers the service worker helpers. Nothing is removed here: the 27 controllers keep working exactly as before, they just say out loud that they are going away in 2.0.0.

Where the notice sits

In the AbstractController constructor, not in connect().

Fifteen of the twenty-seven controllers override connect() without calling super.connect(), so a base-class hook there would silently never fire for them. No controller defines a constructor, and a derived class has no choice but to call super(), so the constructor is the only airtight seam.

NetworkInformationController is the one controller extending Stimulus' Controller directly rather than AbstractController, so it carries the notice itself.

The warning is reported once per controller identifier: a page mounting the same controller on twenty elements should not print the same line twenty times.

[pwa-bundle] The "pwa--web-push" Stimulus controller is deprecated since 1.6.0 and will be
removed in 2.0.0. Copy the controller into your own application and register it there.
See https://github.com/Spomky-Labs/pwa-bundle/issues/372#issuecomment-5295710299

Page-side helpers

onPeriodicSync() and registerPeriodicSync(), exported through the @spomky-labs/pwa/helpers importmap entry, warn too. Their service worker counterpart (registerPeriodicSyncTask, notifyPeriodicSyncClients) is deprecated in #455, so both halves of that protocol leave together.

Package metadata

The npm README gets a deprecation banner and the package description is prefixed. The registry-level npm deprecate @spomky-labs/pwa-bundle@"*" is a separate manual step, worth doing since only 1.4.0-alpha1 was ever published.

What users should do

Copy the controllers you use into your own application and register them there. They are plain Stimulus controllers with no dependency on the bundle, so nothing is lost in the move, and you get to drop the parts you never needed.

Checks

• Behaviour verified against a Stimulus stub: a subclass overriding connect() without calling super still warns; the same identifier twice produces a single warning; the standalone controller and the helper both warn. 6 instantiations, 4 unique warnings.
• node --check on every modified file, package.json still parses
• PHP suite unaffected, 123 tests green