fix: correct Settings actions in Laya ready state and clear stale AI warning (#12)

Offer the right actions in Settings when Laya is ready/available
instead of leaving irrelevant ones, and stop showing the ChannelList
local-AI warning once the runtime is actually available. Derive both
from layaStatusPresentation and cover the ready/available action set
with tests.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/css/main.css

@@ -768,6 +768,10 @@ h4 {
   background: var(--color-bg-tertiary);
 }
 
+.laya-model-panel [hidden] {
+  display: none !important;
+}
+
 .laya-model-heading,
 .laya-model-actions {
   display: flex;