UI is often displaying a continuous stream of characters representing my mouse movements

### Describe the bug

Often on first load, I see a big stream of characters representing my mouse movements, rather than a functioning UI, in addition to the initial session character stream. I don't believe I'm able to prompt after this happens. Often fixes itself after reload. Also on reload it often is updated to the next copilot version, which makes me wonder if it's a byproduct of how copilot is loaded when the auto-update runs first.

Example output:
/ search . enter details . o open . c chat . tab next tab^[[<35;145;1M^[[<35;142;2M^[[<35;138;4M^[[<35;135;5M^[[<35;131;6M^[[<35;129;7M^[[<35;126;8M^[[<35;123;9M^[[<35;121;9M^[[<
35;117;10M^[[<35;114;11M^[[<35;112;12M^[[<35;109;12M^[[<35;106;13M^[[<35;102;13M^[[<35;100;14M^[[<35;97;14M^[[<35;95;14M^[[<35;93;14M^[[<35;93;15M^[[<35;92;15M^[[<35;91;15M^[[<35;
88;14M^[[<35;83;13M^[[<35;78;13M^[[<35;74;12M^[[<35;71;11M^[[<35;65;11M^[[<35;61;10M^[[<35;57;9M^[[<35;55;8M^[[<35;54;8M^[[<35;54;7M^[[<35;54;6M^[[<35;55;6M^[[<35;56;5M^[[<35;57;5
M^[[<35;59;5M^[[<35;61;5M^[[<35;63;5M^[[<35;66;4M^[[<35;69;4M^[[<35;74;4M^[[<35;79;5M^[[<35;83;5M^[[<35;86;5M^[[<35;91;6M^[[<35;96;6....

### Affected version

Now on 1.0.66-1, been happening for about a week

### Steps to reproduce the behavior

On a github, codespace, looking through VSCode , Agency 2026.6.28.1
VSCode Version: 1.126.0 (user setup)
Other VS Code details:
Electron: 42.2.0
ElectronBuildId: 14159160
Chromium: 148.0.7778.97
Node.js: 24.15.0
V8: 14.8.178.14-electron.0

### Expected behavior

Not this happening

### Additional context

bash

未指定來源檔案或測試。首先，在透過 VS Code 檢視時，於 GitHub Codespace 中重現首次載入失敗，並比較正常啟動、重新載入以及所回報的 Copilot 自動更新時機；當滑鼠逸出序列不再以終端文字出現且 UI 仍可使用時，即表示完成。

由索引模型根據 Issue 內容生成。