fix(input): prevent upload_file crash on chooser-opening elements

[ashutoshsinghpr7]

Summary

Fixes #2310 — upload_file crashes the Chrome tab with RESULT_CODE_KILLED_BAD_MESSAGE when used on a chooser-opening proxy element (e.g. a button that calls input.click()).

Root Cause

upload_file called handle.uploadFile() on every element. This method is only valid for <input type="file"> elements. Calling it on a button or other element sends an invalid IPC message to the renderer, causing Chrome to kill the tab.

The crash happened before reaching the existing error-handling catch block, so the fallback waitForFileChooser() path was never reached.

Fix

Check the element type before choosing the upload path:

• <input type="file"> → use uploadFile() directly (fast, safe, unchanged behavior)
• Everything else → use waitForFileChooser() + click() (handles proxy elements correctly)

This matches the documented behavior:

uid: The uid of the file input element or an element that will open file chooser on the page from the page content snapshot

Testing

Self-contained repro from the issue:

1. new_page with a page containing a hidden <input type="file"> + button that triggers input.click()
2. take_snapshot → get button uid
3. upload_file with button uid → no longer crashes tab, file upload succeeds via chooser

Existing file input direct-upload path is unchanged and continues to work.

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