fix: prevent duplicate character insertion in press_key() for contenteditable

[TheMapleBin]

Summary

• press_key() currently sends text on both keyDown and char CDP events.
• Chrome's editing handler may insert text during both phases in contenteditable elements.
• Result: every typed character can appear twice, for example 你好 → 你你好好.

Fix

Remove text from the keyDown event. The char event, which immediately follows, remains the insertion-bearing event.

This preserves the keyDown / keyUp pair for listeners that watch raw keyboard events while ensuring printable text is inserted only once.

Test

Example case:

<div id="ce" contenteditable="true"></div>

fill_input("#ce", "你好测试")
assert js("return document.getElementById('ce').textContent") == "你好测试"

<!-- This is an auto-generated description by cubic. -->
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## Summary by cubic
Fix duplicate character insertion when typing into contenteditable elements.

- **Bug Fixes**
  - Only `char` events carry text in `press_key()`; `keyDown` no longer sends `text` via `Input.dispatchKeyEvent`.
  - Prevents double characters in Chromium contenteditable and keeps `keyDown`/`keyUp` for listeners.

<sup>Written for commit c6f16f2548e2dd3ef442d38ce1aa410180cf01cc. Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

[cubic-dev-ai]

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