Model selector should auto-size to width of longest model name in the Agent Panel

[braverock]

Reproduction steps

The Agent Panel select pop-up menu should auto-size its width to the longest model name.

This is invariant to zoom or to agent provider (e.g. Zed vs OpenCode)

Example:

Current vs. Expected behavior

Example:

Zed version and system specs

Zed: v0.231.1+stable.213.e71b6aa44ffaac9bdaf986288289359e6f1b3572 (Zed)
OS: Linux Wayland ubuntu 25.10
Memory: 122.7 GiB
Architecture: x86_64
GPU: Radeon 8060S Graphics (RADV GFX1151) || radv || Mesa 25.2.8-0ubuntu0.25.10.1

Attach Zed log file

Zed.log

Relevant Zed settings

settings.json

Relevant Keymap

keymap.json

(for AI issues) Model provider details

No response

If you are using WSL on Windows, what flavor of Linux are you using?

None