feat(interaction): add real mouse-wheel primitive

[NianJiuZst]

Summary

• add bsk wheel --delta-y <pixels> [ref-or-selector] backed by the new tool.wheel RPC
• dispatch a native Chromium Input.dispatchMouseEvent with type: "mouseWheel" at the viewport centre or an optional ref/selector action point
• support horizontal deltas and modifiers while preserving Agent Window scope, OOPIF-aware target geometry, cancellation, dialogs, hover state, and overlay bypass

Validation

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets --locked -- -D warnings
• cargo test --workspace --locked (237 CLI/daemon unit tests plus all integration and protocol tests)
• pnpm lint
• extension TypeScript compile, 58 test files / 689 tests, and production build
• node --test scripts/*.test.mjs
• real Chromium probes with the branch-built CLI and unpacked extension in an isolated daemon/profile:
  • viewport mode: --delta-y 600 moved scrollY from 0 to 600; the page observed isTrusted=true
  • targeted mode: wheel '#panel' --delta-y 300 moved the nested panel's scrollTop from 0 to 300 while windowScrollY stayed 0; the page again observed isTrusted=true