TUI: tab close × has an extremely narrow mouse hitbox

Description

In the OpenCode 2 CLI/TUI, the close × button on a tab is very difficult to click with the mouse.

Visually, the × occupies a normal character width, but it feels like only about half of the rendered glyph is actually clickable.

Clicking slightly to one side of the visible × either does nothing or selects the tab instead of closing it.

Screenshot

Attach screenshot here.

Expected behavior

The entire visible × area should be clickable.

Ideally, the mouse hitbox should cover at least the full terminal cell(s) occupied by the close glyph.

Actual behavior

Only a very narrow portion of the visible × seems to trigger the close action.

This makes closing tabs with the mouse unnecessarily difficult.

Possible cause

The close glyph appears to be:

× (U+00D7 MULTIPLICATION SIGN)

U+00D7 has East Asian Width = Ambiguous.

Depending on the terminal / locale / font configuration, it may be rendered as 2 terminal columns while the TUI mouse hitbox calculation treats it as 1 column.

That could explain the behavior where only approximately half of the rendered glyph responds to clicks.

This is only a hypothesis.

As a quick test, replacing × temporarily with ASCII x might help determine whether this is related to terminal cell-width calculation.

Plugins

nothing.

OpenCode version

• OpenCode version: v2.0.8

Steps to reproduce

• Using multi tab.
• Click X to close tab

Screenshot and/or share link

Likely, [><] is rendered as two columns, but only [>] is included in the hitbox.

Operating System

• OS: Linux

Terminal

• Terminal: Zed Editor's internal

Other

• Locale: Japanese / CJK environment
• Display server: Wayland

Start in the TUI tab close control and its mouse hitbox calculation, reproducing the issue with multiple tabs in the reported Linux, Japanese/CJK, Zed terminal environment. Check how the visible × glyph width is measured and verify that the full terminal cell area closes the tab without selecting it.