Callum Law 64ccb9a015 LibWeb: Make @counter-style tree-scoped ...

This was a pretty straightforward change of storing registered counter
styles on the relevant `StyleScope`s and resolving by following the
process to dereference a global tree-scoped name, the only things of
note are:
 - We only define predefined counter styles (e.g. decimal) on the
   document's scope (since otherwise overrides in outer scopes would
   themselves be overriden).
 - When registering counter styles we don't have the full list of
   extendable styles so we defer fallback to "decimal" for undefined
   styles until `CounterStyle::from_counter_style_definition`.

2026-04-15 11:07:38 +01:00

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