feat(core): implement Angular Hydration within Document Fragments#67830
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Introduces a new withHydrationBoundary feature config for provideClientHydration. This allows explicitly configuring the DOM regions that Angular hydration should operate within, replacing the hardcoded document.body default. This is primarily intended for Astro islands and document fragments where Angular does not own the entire document payload. Updates internal core querying mechanisms like verifySsrContentsIntegrity, gatherDeferBlocksCommentNodes, and gatherDeferBlocksByJSActionAttribute to respect the configured boundary elements or selectors.
Introduces renderApplicationParts as a new headless rendering API alongside the existing renderApplication. This provides structural outputs containing separated <head> and <body> HTML segments, reducing the need for meta-frameworks (like Astro) to perform brittle string regex extraction from monolithic <!DOCTYPE html> payloads. This API complements the new withHydrationBoundary feature config on the client for hydration in Astro islands and document fragments.
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…okup This addresses the failure of the prior commit validation by properly isolating the boundary defaults within core without importing the DOCUMENT token from common.
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Resolves #67785. Introduces withHydrationBoundary API and renderApplicationParts API to support Astro Islands and non-destructive fragment hydration.