YeonGyu-Kim 7108d244d1 fix: preserve user-selected variant on first message instead of overriding with fallback chain default
First message variant gate was unconditionally overwriting message.variant
with the fallback chain value (e.g. 'medium' for Hephaestus), ignoring
any variant the user had already selected via OpenCode UI.

Now checks message.variant === undefined before applying the resolved
variant, matching the behavior already used for subsequent messages.

Closes #1861
2026-02-16 13:44:54 +09:00
..