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fix(signals,solid,web): make a failed lazy() hydration observable (#3338)

Root-level lazy() hydration works: the server writes the root module map
(_$HY.r["_assets"]) and hydrate() preloads it before rendering. #3338's
failure is a manifest miss — the server cannot resolve client assets for
the module's key, logs it, and ships no entry — but the client-side error
pointed at a missing Loading boundary, and the failure mode was a page
that looked hydrated with every update dead and nothing observable beyond
console.error.

- lazyHydrationLookup: the not-preloaded error names the real cause (no
  client entry serialized; check the server log) instead of a boundary.
- haltReactivity: hand the cause to reportError where present. A creation-
  time throw is converted to status by ancestor recomputes and never
  reaches the top, so window.onerror / monitoring saw nothing.
- hydrate(): the preload-failure fallback to a fresh client render cannot
  apply to a document root (the shell can't be client-created) and died
  deep in the walk with an unrelated Hydration Mismatch as an unhandled
  rejection. Report an explicit, caused error and leave the server markup.

Co-authored-by: Claude via Cursor <noreply@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

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