chore: roll to 1.59.1

[pavelfeldman]

Bumps the driver to 1.59.1 and ports the public-API changes that landed upstream during the 1.58 → 1.59 cycle.

New public APIs:

• Request.existing_response (property)
• Response.http_version()
• ConsoleMessage.timestamp (property)
• BrowserContext.is_closed()
• BrowserContext.set_storage_state(state | path)
• BrowserContext.debugger (property) + new Debugger class (request_pause, resume, next, run_to, paused_details + pausedstatechanged event)
• Page.aria_snapshot(timeout=, depth=, mode=)
• Page.console_messages(filter=) / Page.page_errors(filter=)
• Page.clear_console_messages() / Page.clear_page_errors()
• Page.pick_locator() / Page.cancel_pick_locator()
• Page.screencast (property) + new Screencast class (start/stop with onFrame callback, show_actions/hide_actions, show_overlay, show_chapter, show_overlays/hide_overlays)
• Locator.normalize()
• Locator.aria_snapshot(depth=, mode=)
• Browser.bind(title, ...) / Browser.unbind()
• BrowserType.launch(artifacts_dir=) / launch_persistent_context(artifacts_dir=)
• Tracing.start(live=)
• CDPSession emits 'close' and forwards 'event' for raw CDP events
• Dialog.dismiss() swallows TargetClosedError

Renames matching upstream:

• BrowserType.connect(ws_endpoint=) -> connect(endpoint=) (positional; the wire field also renamed to "endpoint")

Generator/codegen:

• documentation_provider: emit Promise-without-templates as Any, void as None
• documentation_provider: emit @typing.overload + generic fallback for single-event classes (CDPSession needed this once it gained 'close')
• New TypedDicts in _api_structures.py: DebuggerLocation, DebuggerPausedDetails, ScreencastFrame, BrowserBindResult
• Register Debugger in _object_factory; register Debugger and Screencast in scripts/generate_api.py

Tests added (async + sync mirrors where applicable) for every PORT. expected_api_mismatch.txt is now down to legitimate divergences only.

Tooling:

• New CLAUDE.md with project orientation
• Expanded .claude/skills/playwright-roll/SKILL.md with the operational playbook learned over this roll (langs-verification, audit loop, common doclint quirks, channel-owner wiring checklist).