fix(ui): skip incomplete tool calls during replay

What

• Ignore persisted input-streaming tool parts when rebuilding internal message history.
• Cover static, dynamic, and legacy tool part shapes.

Why

If a request disconnects while tool arguments are still streaming, the frontend can submit that partial UI state on the next request. The inbound adapter currently converts the partial part into a ToolCallPart, so the agent treats it as a replayable trailing tool call and can execute it before the input is complete.

How

Skip only the input-streaming state before creating internal tool calls. Complete input, approval, result, and error states keep their existing behavior.

Verification

• uv run --frozen pytest -q: 594 passed
• Ruff format and lint passed
• mypy passed
• ty passed

Suggested release label: fix.