Feature request: native browser_file_upload tool (setInputFiles equivalent)

[Cocoloco069]

Context

Glance is excellent for vision-first browser testing. However, it lacks a native tool for uploading files via <input type="file"> elements. This blocks any test scenario involving file uploads — a very common use case.

Current workaround

We worked around this using browser_evaluate with a two-step approach:

1. DataTransfer + Object.defineProperty: Build a File from base64, attach to the input via Object.defineProperty, fire change event.
2. React-Fiber injection: Find __reactProps$... key on the input element, call memoizedProps.onChange with a synthetic event.

This works for React-based apps but is fragile (depends on React internals) and doesn't generalize to other frameworks.

Proposed feature

Add mcp__glance__browser_file_upload tool, modeled after Microsoft Playwright MCP's browser_file_upload, which uses Playwright's native setInputFiles. This is:

• Framework-agnostic (works with React, Vue, vanilla JS, Web Components)
• Robust (uses CDP DOM.setFileInputFiles under the hood)
• Well-tested (industry standard via Playwright)

API suggestion

mcp__glance__browser_file_upload({
  selector: string,           // CSS selector or accessibility ref
  filePaths: string[],        // absolute paths on test machine
})

Use case

We're building a humanlike E2E test suite for pdfredo.com (PDF tool platform with 36 tools). Every tool needs file upload as the entry point. Currently we maintain a 100+ line workaround helper. A native tool would simplify our test scenarios significantly.

Reference: Microsoft Playwright MCP file upload — https://github.com/microsoft/playwright-mcp