feat(kit): add user-confirmed service worker updates

[rdlabo]

Summary

• add an opt-in provideKitAppUpdate({ strategy: 'confirm', promptForUpdate }) mode without changing the existing blocking default or background strategy
• wait until the first render before prompting, then reload only when the user accepts; defer on false and retry presentation on undefined
• add KitOverlayController.tryAlertConfirm() so callers can distinguish explicit cancellation from an alert that could not be presented
• detect alerts presented through other Ionic controllers before showing the update confirmation

Compatibility and safety

• preserve the existing KitAppUpdateOptions interface shape for extends/implements/module augmentation consumers
• add a separate provider-options union that requires a prompt only for the confirm strategy and rejects it for existing strategies
• retain runtime guards for untyped JavaScript consumers and package-consumer type checks for valid and invalid combinations
• never call activateUpdate(), avoiding mixed application generations
• keep disabled/uncontrolled service-worker environments as no-ops and do not change package versions

Review cycles

• manager review: approved after 3 rounds
• OSS maintainer review: approved after 3 rounds

Verification

• npm run lint
• npx ng test kit --watch=false (53 files, 1029 tests)
• npm run prebuild
• npm run test:package-consumer
• git diff --check

[github-actions]

npm beta packages published

CI passed for the merge commit 1c53fd4f57fa. Install the immutable package set with:

npm install @rdlabo/ionic-angular-kit@22.0.0-beta.pr102.sha1c53fd4f57fa @rdlabo/ionic-angular-photo-editor@22.0.0-beta.pr102.sha1c53fd4f57fa @rdlabo/ionic-angular-scroll-header@22.0.0-beta.pr102.sha1c53fd4f57fa @rdlabo/ngx-cdk-scroll-strategies@22.0.0-beta.pr102.sha1c53fd4f57fa