Search keyboard handling splits emoji characters

Description

The shared search keyboard handler deletes and moves by UTF-16 code unit instead of Unicode code point. When a model or project search contains an emoji and focus is outside the search input, pressing Backspace can remove only half of the surrogate pair and leave a replacement character in the query. Arrow navigation can likewise place the caret inside the character.

Plugins

None

OpenCode version

1.18.31

Steps to reproduce

1. Open the model picker or project selector.
2. Enter model 🚀 in the search input.
3. Move focus outside the input while keeping the picker open.
4. Press Backspace so the document-level search handler processes the key.

Expected: the rocket is removed as one character, leaving model .

Actual: only one UTF-16 code unit is removed, leaving model �.

Screenshot and/or share link

Not applicable; a focused call to the shared keyboard handler reproduces the malformed string directly.

Operating System

All

Terminal

All