feat(web-integration): expose keyboard type delay via WebPageOpt

[quanru]

Summary

• Make the per-character delay used by keyboard.type configurable instead of being hard-coded to 80ms in packages/web-integration/src/puppeteer/base-page.ts.
• Add a new keyboardTypeDelay?: number option on WebPageOpt, plumbed through PuppeteerAgent / PlaywrightAgent to the underlying Page constructor.
• Introduce a shared DEFAULT_KEYBOARD_TYPE_DELAY = 80 constant in @midscene/shared/constants as the fallback default, preserving current behavior when the option is omitted.

Motivation

Some users need to slow down typing (flaky/legacy inputs that lose characters) or speed it up to near-zero (high-throughput automation / CI). Until now this required forking the package. With this change the delay can be tuned per agent instance:

new PuppeteerAgent(page, { keyboardTypeDelay: 0 });    // instant
new PlaywrightAgent(page, { keyboardTypeDelay: 150 }); // slower
// omit to keep the current 80ms default

Test plan

• pnpm run lint
• npx vitest --run tests/unit-test/web-actions-navigation.test.ts tests/unit-test/yaml/input-mode-typeonly.test.ts tests/unit-test/yaml/input-mode-typeonly-e2e.test.ts (all keyboard.type-related unit tests pass)
• Manually verify with a Puppeteer agent that keyboardTypeDelay: 0 and keyboardTypeDelay: 200 are observed end-to-end

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