test(web-integration): expand input E2E coverage

[quanruzhuoxiu]

Summary

• add a shared local input fixture for browser-backed AI tests
• add seven Puppeteer and seven Playwright input E2E cases
• require every test case to finish with aiAssert, while retaining exact DOM assertions for diagnosis
• route deterministic input actions through the Agent ActionSpace so reports show Locate, Input parameters, before/after screenshots, and Assert in sequence
• keep the public aiInput path as a distinct test that visibly changes the initial value

Coverage

• replace, clear, and caret-preserving typeOnly modes
• text inputs, textareas, and contenteditable elements
• beforeinput, input, and change event delivery
• same-origin and cross-origin iframe input and clearing
• controlled inputs that replace their DOM node after clearing
• the public aiInput path on both Puppeteer and Playwright
• report evidence for every input action instead of only the final state

This is a test-only stacked PR targeting fix/playwright-cut-shortcut so the broader input coverage remains separate from #2938.

Validation

• pnpm run lint
• pnpm run type-check:tests
• PUPPETEER_EXECUTABLE_PATH=/Applications/Google Chrome.app/Contents/MacOS/Google Chrome pnpm exec nx test @midscene/web (447 passed, 1 skipped)
• GitHub Actions: all five PR checks passed, including AI unit tests and Playwright E2E/report jobs
• CI reports confirmed seven passed Puppeteer cases and seven passed Playwright cases
• generated an input-only Playwright report containing seven selectable passed groups and 63 referenced screenshots
• opened all curated reports in Chrome and verified that Locate, Input, Assert, input parameters, UI Context screenshots, and after-calling screenshots render without page, console, or resource errors