v2.1.128 input field mouse text selection broken after UI redesign

Description

After updating to v2.1.128, mouse text selection in the input field no longer works. Previously, users could click and drag to select specific characters in the input box to edit typos or rephrase text. This functionality is broken in the new UI.

Steps to Reproduce

1. Open Claude Code desktop app v2.1.128
2. Type a message in the input field
3. Try to click and drag to select a word or character

Expected Behavior

Mouse click-and-drag should select text in the input field, allowing the user to delete or replace selected characters.

Actual Behavior

Mouse selection does not work. Users are forced to use keyboard shortcuts (arrow keys, Ctrl+W, etc.) to navigate and edit text.

Environment

• Claude Code version: v2.1.128
• OS: macOS
• Model: Sonnet 4.6

Notes

This appears to be a regression introduced by the UI redesign in v2.1.128. The previous (dark theme) interface supported mouse text selection in the input field.