fix+feat(camoufox): ref_id regression fix and scroll parity

[behr-davide]

Two changes bundled into 0.26.0-celeria-camoufox.2 because they both live in the sidecar and both matter for the end-to-end agent loop:

1. FIX: NameError on every page.snapshot call My 0b8c105 "scoped snapshot + ref renumbering" fix renamed the loop- local ref_id -> dom_ref but missed the ref_cache.put(ref_id, ...) call at the end of the same loop. Every snapshot raised internal-error: name 'ref_id' is not defined in the .1 release, which took out the core snapshot->click->fill flow. Fix keeps the two-ref distinction explicit: query the DOM by the pre-filter data-__ab-ref value (dom_ref), cache under the renumbered agent-facing ref (entry["ref"]). A regression test (test_interactive_only_snapshot_then_click_by_ref) exercises the full interactive_only snapshot -> click-by-ref flow and would have caught the original NameError.

2. FEAT: page.scroll + page.scrollIntoView parity with the Chrome path Previously returned not-yet-implemented: action 'Runtime.evaluate' is not yet supported on engine=camoufox because the sidecar had no scroll dispatch. The Rust side already normalises direction/amount -> dx/dy and passes {x, y, selector?} through; the sidecar now:

   • scrolls window when no selector is given
   • scrolls the element's own scroll container when selector is an @en ref or CSS selector
   • centres the element via scrollIntoView({block:'center', inline:'center'}) for page.scrollIntoView, mirroring the Chrome JS exactly
   • classifies Playwright errors into selector-not-found, ambiguous-selector, element-detached, ref-stale, timeout, action-failed (same taxonomy the click/fill paths use)

   Rust-side Camoufox arms added to handle_scroll and
   handle_scrollintoview in actions.rs. The two handlers now dispatch
   on mgr.backend.is_camoufox() and forward to
   mgr.camoufox_client().call("page.scroll"|"page.scrollIntoView"), so
   the sidecar protocol stays high-level rather than carrying CDP
   method strings.

Still deferred to v2: screenshot --annotate. Ref-annotated screenshots need CDP DOM-box extraction; porting it cleanly means either computing bounding boxes via Playwright and compositing server-side or injecting an overlay via page.evaluate. Out of scope for this patch; the existing "not-yet-supported" error message already flags it as a v2 item.

Files:

• packages/camoufox-sidecar/camoufox_sidecar/snapshot.py - ref_id fix
• packages/camoufox-sidecar/camoufox_sidecar/session.py - scroll + scroll_into_view methods
• packages/camoufox-sidecar/camoufox_sidecar/main.py - register page.scroll and page.scrollIntoView handlers
• packages/camoufox-sidecar/tests/test_commands.py - regression test for the ref_id bug + 6 tests covering the scroll surface
• cli/src/native/actions.rs - Camoufox early-returns in handle_scroll and handle_scrollintoview
• package.json + sync-version - bump to 0.26.0-celeria-camoufox.2
• CHANGELOG.md - new release block with Bug Fixes + New Features; previous .1 block demoted to markers