fix(ci): resolve mypy failure and add wait_until default regression tests

[Copilot]

CI make mypy-check was failing due to a type mismatch in the integration test, and the browser_navigate_back/browser_go_forward default change lacked test coverage.

Changes

• Fix mypy error in test_langchain_agui_integration.py: annotate input_data as Any to satisfy langgraph's Pregel.astream overloads, which expect _InputAgentState | Command[Any] | None — not the inferred dict[str, list[dict[str, str]]]

• Add regression tests in TestBrowserNavigationDefaults to lock in wait_until="domcontentloaded" defaults for both nav functions. Uses args_schema.model_fields (Pydantic v2) since @tool wraps the underlying function and inspect.signature does not reach the original parameters:

default = BrowserToolSet.browser_navigate_back.args_schema.model_fields["wait_until"].default
assert default == "domcontentloaded"

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[OhYee]

@copilot merge conflict

[Copilot]

@copilot merge conflict

Resolved in commit 7f603bb. The base branch had merged PR #69 which already added TestBrowserNavigationDefaults (with 4 tests covering both wait_until and timeout defaults). I've updated my branch to use that version while keeping the input_data: Any annotation as the only change on top. Mypy passes with 0 errors and all 27 tests pass.