For typically name-less elements, check the "role" attribute to see if we should
fallback to the content.
Improves a handful of WPT tests, e.g.: /accname/name/comp_text_node.html
(It seems impossible to get 100% on these tests without knowing what is and
isn't a block-level element which would require more knowledge in the
StyleManager).
Page.navigate("about:blank") (and blob:) issued against a non-blank tab
routed through Session.initiateRootNavigation, which always allocated a
pending Page. A pending Page is promoted to active only by
frameHeaderDoneCallback when HTTP response headers arrive — but synthetic
navigations ZIGFLAGS= make no HTTP request, so the pending Page was never committed
and the previous document stayed active (window.location.href, document.URL
and Page.getFrameTree all kept reporting the old page).
Route synthetic URLs through the existing immediate-swap path
(replaceRootImmediate) from initiateRootNavigation, mirroring what
processRootQueuedNavigation already does for JS-initiated synthetic
navigations. replaceRootImmediate now takes (frame_id, url, opts) so both
call sites share it.
Fixes#2363
The prebuilt archive already lives at .lp-cache/prebuilt-v8/<version>.a;
the v8/libc_v8.a symlink was redundant indirection. build.zig has no
implicit lookup, so the Makefile passes -Dprebuilt_v8_path explicitly
anyway. Point it straight at the cached file, dropping the symlink step,
the v8/ dir, and its .gitignore entry. Keep the version-keyed filename so
bumping the V8 pin fetches a new file instead of clobbering.
While both Window and WorkerGlobalState expose the same "Performance" object,
some getters are window specific (e.g. eventCounts). I thought the same object
would always have the same shape and, when not possible, they'd be different
types (e.g. Location vs WorkerLocation). But that isn't always the case. So
.exposed = .window (or .worker, defaulting to .both) can not be defined on the
bridge mapping.
If a worker is in some heavy JS e.g. `for(;;)` it will be stuck forever, even
if the peer closes the CDP connection.
With CDP reads now owned by the network thread, we now correctly detect the
disconnect and simply need to force the worker to shutdown. To achieve this,
on socket close, the CdpLink held by the network is given a terminate_ms (five
seconds from now) and added to a linked list. On every wakeup, the network
thread can check the list + timestamp and, if necessary, call Isolate::Terminate
(which is safe to call on a different thread).
