Files
ladybird/Libraries/LibWeb/SVG
Aliaksandr Kalenik 2645695fdd LibWeb: Make Navigable directly own its active document
Previously, the active document's lifecycle was bound to
SessionHistoryEntry via DocumentState. The ownership chain was:
  Navigable → SessionHistoryEntry → DocumentState → Document

This made it impossible to move SessionHistoryEntry to the UI process
(which cannot own DOM::Document). This commit decouples the two by
giving Navigable a direct m_active_document field that serves as the
authoritative source for active_document().

- Navigable owns m_active_document directly; active_document() reads
  from it instead of going through the active session history entry.

- DocumentState no longer holds a Document pointer. Instead, it stores
  a document_id for "same document?" checks. Same-document navigations
  share a DocumentState and thus the same document_id, while
  cross-document navigations create a new DocumentState with a new ID.

- A pending_document parameter is threaded through
  finalize_a_cross_document_navigation → apply_the_push_or_replace →
  apply_the_history_step so the newly created document reaches
  activation without being stored on DocumentState.

- For traversal, the population output delivers the document.
  A resolved_document is computed per continuation from either the
  pending document, the population output, or the current active
  document (for same-document traversals).
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